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Homonyms

IRMNG homonym list - genus level - Initial letter = "X" (177)

Please note, this is a provisional homonyms list from IRMNG on 2024-03-28, and is subject to change. It may include nomina nuda, rejected and otherwise non-current names, plus some published misspellings, in addition to homonyms that have been validly published. A small proportion of duplicate entries awaiting rationalisation may also be included.

Click on any genus name for additional details, as currently available.

Xaenia
 Xaenia Faust, 1891 accepted as Xynaea Pascoe, 1865 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Curculionidae (Family)
 Xaenia Duchassaing & Michelotti, 1860 accepted as Xenia Lamarck, 1816 · Animalia (Kingdom) > Cnidaria (Phylum) > Anthozoa (Class) > Alcyonacea (Order) > Xeniidae (Family)

Xana
     Xana Kurdjumov, 1917 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Signiphoridae (Family)
     Xana Díaz Cosín, Briones & Trigo, 1989 accepted as Xanina Díaz Cosín, Briones & Trigo in Marchán et al., 2018 (junior homonym)· Animalia (Kingdom) > Annelida (Phylum) > Clitellata (Class) > Haplotaxida (Order) > Hormogastridae (Family)
     Xana Garcia-Alcalde, 1972 † accepted as Xanastur García-Alcalde, 2021 † (junior homonym)· Animalia (Kingdom) > Brachiopoda (Phylum) > Rhynchonellata (Class) > Terebratulida (Order) > (Family)

Xandaros
     Xandaros Maciolek, 1981 · Animalia (Kingdom) > Annelida (Phylum) > Polychaeta (Class) > Spionida (Order) > Spionidae (Family)
 Xandaros Bishop, 1988 † accepted as Xandarocarcinus Karasawa, Schweitzer & Feldmann, 2011 † · Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Decapoda (Order) > Xandarocarcinidae (Family)

Xanthea
     Xanthea Copper, 1996 † · Animalia (Kingdom) > Brachiopoda (Phylum) > Rhynchonellata (Class) > Atrypida (Order) > Atrypinidae (Family)
     Xanthea Lesson, 1837 (uncertain)· Animalia (Kingdom) > Cnidaria (Phylum) > Cnidaria (awaiting allocation) (Class) > Cnidaria (awaiting allocation) (Order) > Cnidaria (awaiting allocation) (Family)

Xanthia
 Xanthia Hübner, 1809-1813 accepted as Xanthia Hübner, 1809-1813 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Noctuidae (Family)
     Xanthia Fairmaire, 1893 accepted as Xanthalia Fairmaire, 1894 (junior homonym)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Tenebrionidae (Family)

Xanthidium
     Xanthidium Ehrenberg ex Ralfs, 1848 · Plantae (Kingdom) > Charophyta (Phylum) > Zygnematophyceae (Class) > Desmidiales (Order) > Desmidiaceae (Family)
     Xanthidium Robertson, 1903 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Hymenoptera (awaiting allocation) (Family)
     Xanthidium Ehrenberg, 1834 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Crustacea (awaiting allocation) (Class) > Crustacea (awaiting allocation) (Order) > Crustacea (awaiting allocation) (Family)
 Xanthidium Delpino, 1871 accepted as Ambrosia Linnaeus, 1753 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asterales (Order) > Asteraceae (Family)

Xantho
 Xantho Dutrochet, 1819 accepted as Xantho Dutrochet, 1819 · Animalia (Kingdom) > Annelida (Phylum) > Clitellata (Class) > Oligochaeta (awaiting allocation) (Order) > Oligochaeta (awaiting allocation) (Family)
     Xantho Leach, 1814 · Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Decapoda (Order) > Xanthidae (Family)
     Xantho E.J. Remy, 1849 (uncertain)· Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asterales (Order) > Asteraceae (Family)

Xanthocera
     Xanthocera Amsel, 1953 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Lepidoptera (awaiting allocation) (Family)
     Xanthocera Townsend, 1915 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Tachinidae (Family)

Xanthochilus
     Xanthochilus Stål, 1872 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Lygaeidae (Family)
 Xanthochilus Bedel, 1909 accepted as Xanthochelus Chevrolat, 1873 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Curculionidae (Family)
 Xanthochilus Amyot, 1846 accepted as Xanthochilus Stål, 1872 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Lygaeidae (Family)

Xanthodes
     Xanthodes Guenée, 1852 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Nolidae (Family)
 Xanthodes Dana, 1852 accepted as Xanthias Rathbun, 1897 · Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Decapoda (Order) > Xanthidae (Family)

Xanthogramma
     Xanthogramma Schiner, 1860 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Syrphidae (Family)
 Xanthogramma Weise, 1923 accepted as Chrysophtharta Weise, 1901 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Chrysomelidae (Family)

Xantholeuca
     Xantholeuca Stephens, 1831 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Lepidoptera (awaiting allocation) (Family)
 Xantholeuca Hampson, 1910 accepted as Chionoxantha Hampson, 1914 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Noctuidae (Family)

Xantholinus
     Xantholinus Dejean, 1821 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Staphylinidae (Family)
     Xantholinus Serville, 1825 accepted as Xantholinus Dejean, 1821 (unavailable name)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Staphylinidae (Family)

Xanthomantis
     Xanthomantis Warren in Seitz, 1909 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Noctuidae (Family)
     Xanthomantis Giglio-Tos, 1915 accepted as Malayamantis Koçak & Kemal, 2008 (junior homonym)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Mantodea (Order) > Nanomantidae (Family)

Xanthomima
     Xanthomima Warren, 1897 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Geometridae (Family)
 Xanthomima Semenov, 1900 accepted as Colobostomus Fairmaire, 1886 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Oedemeridae (Family)

Xanthomixis
     Xanthomixis Sharpe, 1881 (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Passeriformes (Order) > Sylviidae (Family)
 Xanthomixis Beck, 1996 accepted as Polymixis Hübner, 1820 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Noctuidae (Family)

Xanthomonas
     Xanthomonas W.J. Dowson, 1939 (Approved Lists, 1980) · Bacteria (Kingdom) > Proteobacteria (Phylum) > Gammaproteobacteria (Class) > Lysobacterales (Order) > Lysobacteraceae (Family)
 Xanthomonas R. Scagel & J. Stein, 1961 accepted as Xanthophycomonas R. Scagel & J. Stein, 1961 · Chromista (Kingdom) > Ochrophyta (Phylum) > Xanthophyceae (Class) > (Order) > (Family)

Xanthopsis
 Xanthopsis Schafhäutl, 1863 accepted as Xanthopsis Schafhäutl, 1863 · Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Decapoda (Order) > Xanthidae (Family)
 Xanthopsis A. Acloque, 1893 accepted as Catolechia Flotow, 1850 · Fungi (Kingdom) > Ascomycota (Phylum) > Lecanoromycetes (Class) > Rhizocarpales (Order) > Rhizocarpaceae (Family)
 Xanthopsis (A.P. de Candolle) K.H.E. Koch, 1851 accepted as Psephellus Cassini in F. Cuvier, 1826 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asterales (Order) > Asteraceae (Family)

Xanthopsora
 Xanthopsora G. Schneider & W.A. Weber in G. Schneider, 1979 accepted as Xanthopsorella K. Kalb & J. Hafellner in J. Hafellner, 1984 · Fungi (Kingdom) > Ascomycota (Phylum) > Lecanoromycetes (Class) > Rhizocarpales (Order) > Catillariaceae (Family)
 Xanthopsora Spegazzini, 1922 accepted as Linochora F. von Höhnel, 1910 · Fungi (Kingdom) > Ascomycota (Phylum) > Sordariomycetes (Class) > Phyllachorales (Order) > Phyllachoraceae (Family)

Xanthoptera
     Xanthoptera Sodovsky, 1837 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Noctuidae (Family)
     Xanthoptera Guenée, 1852 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Noctuidae (Family)

Xanthosia
     Xanthosia Rudge, 1811 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Apiales (Order) > Araliaceae (Family)
     Xanthosia Bell, 1863 † · Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Decapoda (Order) > Etyidae (Family)

Xanthosoma
     Xanthosoma Ashmead, 1888 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Eurytomidae (Family)
     Xanthosoma H.W. Schott in H.W. Schott & Endlicher, 1832 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Alismatales (Order) > Araceae (Family)

Xanthospila
     Xanthospila Fairmaire, 1884 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Cerambycidae (Family)
 Xanthospila Houlbert in Oberthuer, 1918 accepted as Tosxampila Oiticica Filho, 1955 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Castniidae (Family)

Xanthostigma
     Xanthostigma Navás, 1909 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Raphidioptera (Order) > Raphidiidae (Family)
     Xanthostigma Kennedy, 1920 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Odonata (Order) > Pseudostigmatidae (Family)

Xanthothopia
     Xanthothopia Gemminger, 1870 accepted as Xanthothopeia Mäklin, 1867 (unjustified emendation)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Tenebrionidae (Family)
     Xanthothopia Lucas, 1920 accepted as Xanthothopia Gemminger, 1870 (unavailable name)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Tenebrionidae (Family)

Xanthoxylum
 Xanthoxylum H. Yabe & S. Endô, 1930 † accepted as · Plantae (Kingdom) > Plantae (awaiting allocation) (Phylum) > Plantae (awaiting allocation) (Class) > Plantae (awaiting allocation) (Order) > Plantae (awaiting allocation) (Family)
 Xanthoxylum P. Miller, 1768 accepted as Zanthoxylum Linnaeus, 1753 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Sapindales (Order) > Rutaceae (Family)

Xanthozona
     Xanthozona Townsend, 1908 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Diptera (awaiting allocation) (Family)
 Xanthozona Hampson, 1910 accepted as Xanthomera Hampson, 1914 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Noctuidae (Family)

Xanthus
 Xanthus Agassiz, 1843 accepted as Xantho Leach, 1814 · Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Decapoda (Order) > Xanthidae (Family)
 Xanthus Dietz, 1891 accepted as Dietzianus Sleeper, 1953 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Curculionidae (Family)
 Xanthus Gistl, 1834 accepted as Melanotus Eschscholtz, 1829 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Elateridae (Family)

Xarifa
     Xarifa Fall, 1905 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Ptinidae (Family)
 Xarifa Humes, 1960 accepted as Xarifia Humes, 1960 · Animalia (Kingdom) > Arthropoda (Phylum) > Maxillopoda (Class) > Cyclopoida (Order) > Xarifiidae (Family)

Xela
     Xela Jell in Bengtson, Conway Morris, Cooper, Jell & Runnegar, 1990 † · Animalia (Kingdom) > Arthropoda (Phylum) > Trilobita (Class) > Redlichiida (Order) > Chengkouaspidae (Family)
 Xela Thompson & Vockeroth in Thompson, 1999 accepted as Cepa Thompson & Vockeroth in Thompson, 2007 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Syrphidae (Family)
     Xela Botero, Bezark & Santos-Silva, 2020 accepted as Neoxela Botero, Bezark & Santos-Silva, 2022 (junior homonym)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Cerambycidae (Family)

Xena
     Xena Narchuk, 1964 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Chloropidae (Family)
 Xena Martins-Neto, 1999 † accepted as Netoxena Sohn in Sohn et al., 2012 † · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Eolepidopterigidae (Family)

Xenacanthus
     Xenacanthus Beyrich, 1848 † · Animalia (Kingdom) > Chordata (Phylum) > Chondrichthyes (Class) > Xenacanthiformes (Order) > Xenacanthidae (Family)
 Xenacanthus Bremekamp, 1944 accepted as Strobilanthes Blume, 1826 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Lamiales (Order) > Acanthaceae (Family)

Xenadidactus
     Xenadidactus Damoiseau, 1979 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Brentidae (Family)
 Xenadidactus Damoiseau, 1972 accepted as Xenadidactus Damoiseau, 1979 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Brentidae (Family)

Xenapates
     Xenapates Kirby, 1882 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Hymenoptera (awaiting allocation) (Family)
     Xenapates Eaton, 1904 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Psychodidae (Family)

Xenaspis
     Xenaspis Osten-Sacken, 1881 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Platystomatidae (Family)
     Xenaspis Waagen, 1895 † (uncertain)· Animalia (Kingdom) > Mollusca (Phylum) > Cephalopoda (Class) > Ceratitida (Order) > Xenodiscidae (Family)

Xenaster
     Xenaster Simonwitsch, 1871 † · Animalia (Kingdom) > Echinodermata (Phylum) > Asteroidea (Class) > Pustulosida (Order) > Xenasteridae (Family)
     Xenaster Bierig, 1939 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Staphylinidae (Family)
 Xenaster Mahunka, 1970 accepted as Brasilopsis Mahunka, 1975 · Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Actinedida (Order) > Pygmephoridae (Family)

Xenella
     Xenella Cobb, 1920 · Animalia (Kingdom) > Nematoda (Phylum) > Enoplea (Class) > Trefusiida (Order) > Xenellidae (Family)
 Xenella Rauther in Kükenthal & Krumbach, 1930 accepted as Xennella Cobb, 1920 · Animalia (Kingdom) > Nematoda (Phylum) > Enoplea (Class) > Trefusiida (Order) > Xenellidae (Family)

Xenia
     Xenia Lamarck, 1816 · Animalia (Kingdom) > Cnidaria (Phylum) > Anthozoa (Class) > Alcyonacea (Order) > Xeniidae (Family)
 Xenia M. Gerbaulet, 1992 accepted as Grahamia Gillies in W.J. Hooker & Arnott, 1833 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Caryophyllales (Order) > Anacampserotaceae (Family)
 Xenia Faust, 1894 accepted as Faustiella Berg, 1898 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Curculionidae (Family)

Xenica
     Xenica Westwood in Doubleday & Westwood, 1851 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Nymphalidae (Family)
 Xenica Brunner, 1891 accepted as Xenicola Uvarov, 1940 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Orthoptera (Order) > Tettigoniidae (Family)

Xenium
     Xenium Liana, 1980 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Orthoptera (Order) > Proscopiidae (Family)
     Xenium Gorbach, 1985 † · Animalia (Kingdom) > Mollusca (Phylum) > Bivalvia (Class) > Pterioida (Order) > Pterioida (awaiting allocation) (Family)

Xenobatrisus
     Xenobatrisus Jeannel, 1949 † (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Staphylinidae (Family)
     Xenobatrisus Wasmann, 1918 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Staphylinidae (Family)

Xenobius
     Xenobius Borgmeier, 1931 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Staphylinidae (Family)
     Xenobius Zhang & Hu, 1985 (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Amphibia (Class) > Caudata (Order) > Hynobiidae (Family)

Xenocara
 Xenocara Regan, 1904 accepted as Ancistrus Kner, 1854 · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Siluriformes (Order) > Loricariidae (Family)
 Xenocara Pic, 1912 accepted as Xenocera Broun, 1881 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Ptinidae (Family)
 Xenocara Lucas, 1920 accepted as Xenocera Broun, 1881 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Ptinidae (Family)

Xenocephalus
     Xenocephalus Kaup, 1858 · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Perciformes (Order) > Uranoscopidae (Family)
 Xenocephalus Leakey, 1965 † accepted as Megalotragus van Hoepen, 1932 † · Animalia (Kingdom) > Chordata (Phylum) > Mammalia (Class) > Artiodactyla (Order) > Bovidae (Family)
 Xenocephalus Wasmann, 1887 accepted as Vatesus Sharp, 1876 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Staphylinidae (Family)

Xenocera
     Xenocera Broun, 1881 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Ptinidae (Family)
     Xenocera Borchmann, 1936 accepted as Xenocerogria Merkl, 2007 (junior homonym)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Tenebrionidae (Family)

Xenocerus
     Xenocerus Germar in Schönherr, 1833 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Anthribidae (Family)
     Xenocerus Germar, 1829 accepted as Xenocerus Germar in Schönherr, 1833 (nomen nudum)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Anthribidae (Family)

Xenocharis
     Xenocharis Delucchi, 1954 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Hymenoptera (awaiting allocation) (Family)
     Xenocharis Bierig, 1934 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Coleoptera (awaiting allocation) (Family)

Xenochirus
 Xenochirus Gilbert, 1890 accepted as Xeneretmus Gilbert in Jordan, 1903 · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Scorpaeniformes (Order) > Agonidae (Family)
 Xenochirus Gloger, 1841 accepted as Petaurus Shaw, 1791 · Animalia (Kingdom) > Chordata (Phylum) > Mammalia (Class) > Diprotodontia (Order) > Petauridae (Family)

Xenochroma
     Xenochroma Warren, 1902 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Geometridae (Family)
     Xenochroma Schmidt, 1924 accepted as Monnechroma Napp & Martins, 2005 (junior homonym)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Cerambycidae (Family)

Xenococcus
     Xenococcus Silvestri, 1924 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Pseudococcidae (Family)
     Xenococcus G. Thuret in É. Bornet & G. Thuret, 1880 · Bacteria (Kingdom) > Cyanobacteria (Phylum) > Cyanophyceae (Class) > Chroococcales (Order) > Xenococcaceae (Family)

Xenocrinus
     Xenocrinus Miller, 1881 † · Animalia (Kingdom) > Echinodermata (Phylum) > Crinoidea (Class) > Monobathrida (Order) > Monobathrida (awaiting allocation) (Family)
     Xenocrinus Jahn, 1892 † (uncertain)· Animalia (Kingdom) > Echinodermata (Phylum) > Echinodermata (awaiting allocation) (Class) > Echinodermata (awaiting allocation) (Order) > Echinodermata (awaiting allocation) (Family)

Xenocypris
     Xenocypris Triebel, 1962 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Ostracoda (Class) > Ostracoda (awaiting allocation) (Order) > Ostracoda (awaiting allocation) (Family)
     Xenocypris Günther, 1868 · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Cypriniformes (Order) > Cyprinidae (Family)

Xenodochus
     Xenodochus Schlechtendal, 1826 · Fungi (Kingdom) > Basidiomycota (Phylum) > Pucciniomycetes (Class) > Pucciniales (Order) > Phragmidiaceae (Family)
     Xenodochus Andrewes, 1941 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Carabidae (Family)

Xenodon
     Xenodon Boie in Férussac, 1826 · Animalia (Kingdom) > Chordata (Phylum) > Reptilia (Class) > Squamata (Order) > Colubridae (Family)
 Xenodon Rüppell, 1836 accepted as Odonus Gistel, 1848 · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Tetraodontiformes (Order) > Balistidae (Family)

Xenodus
     Xenodus Miller, 1892 † (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Pisces (awaiting allocation) (Class) > Pisces (awaiting allocation) (Order) > Pisces (awaiting allocation) (Family)
 Xenodus Andrewes, 1924 accepted as Xenodochus Andrewes, 1941 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Carabidae (Family)

Xenogaster
     Xenogaster Wasmann, 1891 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Staphylinidae (Family)
 Xenogaster Mason, 1981 accepted as Beyarslania Koçak & Kemal, 2009 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Braconidae (Family)

Xenognathus
     Xenognathus Malloch, 1930 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Platystomatidae (Family)
 Xenognathus Gilbert, 1915 accepted as Conocara Goode & Bean, 1896 · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Osmeriformes (Order) > Alepocephalidae (Family)
 Xenognathus Jordan, 1928 accepted as Ganthoxena Alonso-Zarazaga & Lyal, 1999 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Anthribidae (Family)
     Xenognathus Case, 1928 † accepted as Colognathus Case, 1933 † (junior homonym)· Animalia (Kingdom) > Chordata (Phylum) > Reptilia (Class) > Procolophonoidea (Order) > Colognathidae (Family)

Xenogomphus
     Xenogomphus Needham, 1944 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Odonata (Order) > Odonata (awaiting allocation) (Family)
     Xenogomphus Needham, 1948 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Odonata (Order) > Odonata (awaiting allocation) (Family)

Xenometra
     Xenometra Emery, 1917 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Hymenoptera (awaiting allocation) (Family)
 Xenometra Ozaki, 1932 accepted as Ozametra Marcus, 1949 · Animalia (Kingdom) > Platyhelminthes (Phylum) > Turbellaria (Class) > Neorhabdocoela (Order) > Umagillidae (Family)

Xenomystus
     Xenomystus Günther, 1868 · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Osteoglossiformes (Order) > Notopteridae (Family)
 Xenomystus Lütken, 1874 accepted as Hemipsilichthys Eigenmann & Eigenmann, 1889 · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Siluriformes (Order) > Loricariidae (Family)

Xenoneura
     Xenoneura Warren, 1896 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Lepidoptera (awaiting allocation) (Family)
     Xenoneura Scudder in Dawson, 1866 † (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Orthoptera (Order) > Orthoptera (awaiting allocation) (Family)

Xenopathia
     Xenopathia Rebel, 1902 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Blastobasidae (Family)
     Xenopathia Rebel in Staudinger & Rebel, 1901 accepted as Xenopathia Rebel, 1902 (nomen nudum)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Blastobasidae (Family)

Xenopeltis
     Xenopeltis H. Sydow & P. Sydow, 1919 · Fungi (Kingdom) > Ascomycota (Phylum) > Ascomycota incertae sedis (Class) > Ascomycota incertae sedis (Order) > Ascomycota incertae sedis (Family)
     Xenopeltis Reinwardt in Férussac, 1826 accepted as Xenopeltis Reinwardt in Férussac, 1826 (nomen nudum)· Animalia (Kingdom) > Chordata (Phylum) > Reptilia (Class) > Squamata (Order) > Xenopeltidae (Family)

Xenophanes
     Xenophanes Godman & Salvin, 1895 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Hesperiidae (Family)
 Xenophanes Thomson, 1877 accepted as Xenophanes Thomson, 1877 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Hymenoptera (awaiting allocation) (Family)

Xenophasia
 Xenophasia Strickland, 1841 accepted as Xenophasia Strickland, 1841 · Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Aves (awaiting allocation) (Order) > Aves (awaiting allocation) (Family)
     Xenophasia Townsend, 1934 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Tachinidae (Family)

Xenophasma
     Xenophasma Dognin, 1905 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Pyralidae (Family)
     Xenophasma Redtenbacher in Brunner & Redtenbacher, 1908 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Phasmatodea (Order) > Phasmatidae (Family)

Xenophlebia
     Xenophlebia Demoulin, 1968 † · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Ephemeroptera (Order) > Leptophlebiidae (Family)
 Xenophlebia Riek, 1976 † accepted as Litophlebia Hubbard & Riek, 1978 † · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Ephemeroptera (Order) > Litophlebiidae (Family)

Xenopholis
     Xenopholis Peters, 1869 · Animalia (Kingdom) > Chordata (Phylum) > Reptilia (Class) > Squamata (Order) > Colubridae (Family)
 Xenopholis Davis, 1887 † accepted as Trewavasia White & Moy-Thomas, 1941 † · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Pycnodontiformes (Order) > Pycnodontiformes (awaiting allocation) (Family)

Xenophonus
     Xenophonus Blackwall, 1864 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Arachnida (awaiting allocation) (Order) > Arachnida (awaiting allocation) (Family)
     Xenophonus Müller, 1942 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Carabidae (Family)

Xenoplia
     Xenoplia Warren, 1894 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Lepidoptera (awaiting allocation) (Family)
     Xenoplia Medvedev, 1952 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Coleoptera (awaiting allocation) (Family)

Xenopoma
     Xenopoma Willdenow, 1811 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Lamiales (Order) > Lamiaceae (Family)
     Xenopoma Crosse, 1890 · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Littorinimorpha (Order) > Annulariidae (Family)

Xenopopillia
     Xenopopillia Kolbe, 1968 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Coleoptera (awaiting allocation) (Family)
 Xenopopillia Kolbe, 1910 accepted as Popillia Serville, 1825 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Scarabaeidae (Family)

Xenoppia
     Xenoppia Mahunka, 1982 · Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Oribatida (Order) > Oppiidae (Family)
     Xenoppia Townsend, 1915 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Sarcophagidae (Family)

Xenops
     Xenops Illiger, 1811 · Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Passeriformes (Order) > Furnariidae (Family)
     Xenops Leach, 1815 accepted as Xenos Rossi, 1794 (unjustified emendation)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Strepsiptera (Order) > Xenidae (Family)

Xenopsis
     Xenopsis Saunders, 1867 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Buprestidae (Family)
 Xenopsis Johnson, 1969 accepted as Austrosiphon Fisher, 1954 · Animalia (Kingdom) > Sipuncula (Phylum) > Sipunculidea (Class) > Sipunculoidea (Order) > Sipunculidae (Family)

Xenopteryx
     Xenopteryx Dybas, 1961 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Ptiliidae (Family)
 Xenopteryx Pagenstecher, 1909 accepted as Xeropteryx Butler, 1883 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Geometridae (Family)

Xenopus
     Xenopus Wagler, 1827 · Animalia (Kingdom) > Chordata (Phylum) > Amphibia (Class) > Anura (Order) > Pipidae (Family)
     Xenopus Penzig & P.A. Saccardo, 1901 · Fungi (Kingdom) > Basidiomycota (Phylum) > Agaricomycetes (Class) > Agaricomycetes incertae sedis (Order) > Agaricomycetes incertae sedis (Family)
 Xenopus Roelofs, 1875 accepted as Ixalma Pascoe, 1871 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Curculionidae (Family)

Xenopyxis
     Xenopyxis Townsend, 1940 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Tachinidae (Family)
 Xenopyxis Gilbert, 1915 accepted as Xeneretmus Gilbert in Jordan, 1903 · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Scorpaeniformes (Order) > Agonidae (Family)

Xenorhinus
 Xenorhinus Faust, 1886 accepted as Beardiella Alonso-Zarazaga & Lyal, 1999 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Curculionidae (Family)
     Xenorhinus Leconte & Horn, 1883 accepted as Homalirhinus Chevrolat, 1833 (junior subjective synonym)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Laemophloeidae (Family)

Xenoscelis
     Xenoscelis Wollaston, 1864 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Erotylidae (Family)
 Xenoscelis Sen Gupta & Crowson, 1971 accepted as Xenoscelis Wollaston, 1864 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Erotylidae (Family)

Xenosina
     Xenosina Malloch, 1925 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Muscidae (Family)
     Xenosina Warren, 1900 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Lepidoptera (awaiting allocation) (Family)

Xenosoma
     Xenosoma H. Sydow & P. Sydow, 1921 · Fungi (Kingdom) > Basidiomycota (Phylum) > Agaricomycetes (Class) > Agaricomycetes incertae sedis (Order) > Agaricomycetes incertae sedis (Family)
     Xenosoma Chamberlin, 1945 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Diplopoda (Class) > Polydesmida (Order) > Paradoxosomatidae (Family)
     Xenosoma Felder, 1874 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Erebidae (Family)

Xenostephanus
     Xenostephanus Arkell & Callomon, 1963 † · Animalia (Kingdom) > Mollusca (Phylum) > Cephalopoda (Class) > Ammonitida (Order) > Perisphinctidae (Family)
     Xenostephanus Simpson, Minoprio & Patterson, 1962 † · Animalia (Kingdom) > Chordata (Phylum) > Mammalia (Class) > Notoungulata (Order) > Oldfieldthomasiidae (Family)

Xenostigmus
     Xenostigmus Smith, 1944 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Braconidae (Family)
 Xenostigmus Riek, 1966 accepted as Bortesia Pagliano & Scaramozzino, 1989 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Megastigmidae (Family)

Xenostrobus
     Xenostrobus R. Daber, 1957 † (uncertain)· Plantae (Kingdom) > Plantae (awaiting allocation) (Phylum) > Plantae (awaiting allocation) (Class) > Plantae (awaiting allocation) (Order) > Plantae (awaiting allocation) (Family)
     Xenostrobus Wilson, 1967 · Animalia (Kingdom) > Mollusca (Phylum) > Bivalvia (Class) > Mytiloida (Order) > Mytilidae (Family)

Xenostylus
     Xenostylus Bates, 1885 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Cerambycidae (Family)
     Xenostylus Goin, Case, Woodburne, Vizcaíno & Reguero, 1999 † accepted as Xenostylos Goin, 2007 † (junior homonym)· Animalia (Kingdom) > Chordata (Phylum) > Mammalia (Class) > Didelphimorphia (Order) > Derorhynchidae (Family)

Xenotermes
     Xenotermes Holmgren, 1912 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Blattodea (Order) > Isoptera (awaiting allocation) (Family)
     Xenotermes Wasmann, 1896 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Tenebrionidae (Family)

Xenotherium
     Xenotherium Ameghino, 1904 † · Animalia (Kingdom) > Chordata (Phylum) > Mammalia (Class) > Notoungulata (Order) > Mesotheriidae (Family)
 Xenotherium Douglass, 1905 † accepted as Epoicotherium Simpson, 1927 † · Animalia (Kingdom) > Chordata (Phylum) > Mammalia (Class) > Cimolesta (Order) > Epoicotheriidae (Family)

Xenothyris
     Xenothyris Ching, Sun & Rong, 1976 † · Animalia (Kingdom) > Brachiopoda (Phylum) > Rhynchonellata (Class) > Terebratulida (Order) > Terebrataliidae (Family)
     Xenothyris Townes, 1969 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Ichneumonidae (Family)

Xenurus
     Xenurus Boie, 1826 (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Aves (awaiting allocation) (Order) > Aves (awaiting allocation) (Family)
 Xenurus Wagler, 1830 accepted as Cabassous McMurtrie in Cuvier, 1831 · Animalia (Kingdom) > Chordata (Phylum) > Mammalia (Class) > Cingulata (Order) > Dasypodidae (Family)

Xenus
     Xenus J. Kohlmeyer & B. Volkmann-Kohlmeyer, 1992 · Fungi (Kingdom) > Ascomycota (Phylum) > Eurotiomycetes (Class) > Pyrenulales (Order) > Pyrenulales incertae sedis (Family)
     Xenus Kaup, 1829 · Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Charadriiformes (Order) > Scolopacidae (Family)
     Xenus Péringuey, 1899 accepted as Aphrotus Péringuey, 1904 (junior homonym)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Tenebrionidae (Family)
     Xenus Agassiz, 1846 accepted as Xenos Rossi, 1794 (unjustified emendation)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Strepsiptera (Order) > Xenidae (Family)

Xeris
     Xeris Costa, 1894 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Siricidae (Family)
     Xeris Medicus, 1791 (uncertain)· Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asparagales (Order) > Iridaceae (Family)

Xerobia
     Xerobia Stål, 1873 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Hemiptera (awaiting allocation) (Family)
 Xerobia Gistel, 1856 accepted as Cleonis Dejean, 1821 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Curculionidae (Family)

Xerocarpa
 Xerocarpa (G. Don) E. Spach, 1840 accepted as Xerocarpa (G. Don) E. Spach, 1840 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asterales (Order) > Goodeniaceae (Family)
 Xerocarpa H.J. Lam, 1919 accepted as Teijsmanniodendron Koorders, 1904 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Lamiales (Order) > Lamiaceae (Family)

Xerocarpus
 Xerocarpus P.A. Karsten, 1881 accepted as Phanerochaete P.A. Karsten, 1889 · Fungi (Kingdom) > Basidiomycota (Phylum) > Agaricomycetes (Class) > Polyporales (Order) > Phanerochaetaceae (Family)
 Xerocarpus Guillemin & Perrottet in Guillemin, Perrottet & A. Richard, 1832 accepted as Rothia Persoon, 1807 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Fabales (Order) > Fabaceae (Family)

Xerococcus
     Xerococcus Ferris, 1921 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Eriococcidae (Family)
     Xerococcus Oersted, 1852 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Gentianales (Order) > Rubiaceae (Family)

Xerodesmus
 Xerodesmus Chamberlin, 1923 accepted as Kapyrodesmus Attems, 1940 · Animalia (Kingdom) > Arthropoda (Phylum) > Diplopoda (Class) > Polydesmida (Order) > Pyrgodesmidae (Family)
     Xerodesmus Cook, 1896 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Diplopoda (Class) > Diplopoda (awaiting allocation) (Order) > (Family)

Xerophila
 Xerophila Held, 1837 accepted as Theba Risso, 1826 · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Stylommatophora (Order) > Oxychilidae (Family)
 Xerophila Gould, 1841 accepted as Aphelocephala Oberholser, 1899 · Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Passeriformes (Order) > Acanthizidae (Family)

Xerophyllum
     Xerophyllum Fairmaire, 1846 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Orthoptera (Order) > Tetrigidae (Family)
     Xerophyllum A. Michaux, 1803 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Liliales (Order) > Melanthiaceae (Family)

Xeroplana
     Xeroplana Monterosato, 1893 (uncertain)· Animalia (Kingdom) > Mollusca (Phylum) > Mollusca (awaiting allocation) (Class) > Mollusca (awaiting allocation) (Order) > Mollusca (awaiting allocation) (Family)
 Xeroplana Briquet, 1895 accepted as Stilbe P.J. Bergius, 1767 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Lamiales (Order) > Stilbaceae (Family)

Xeropteryx
     Xeropteryx Kiriakoff, 1963 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Lepidoptera (awaiting allocation) (Family)
     Xeropteryx Butler, 1883 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Geometridae (Family)
 Xeropteryx Redtenbacher in Brunner v. Wattenwyl, 1895 accepted as Xerophyllopteryx Rehn, 1905 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Orthoptera (Order) > Tettigoniidae (Family)

Xestia
     Xestia Hübner, 1818 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Noctuidae (Family)
     Xestia Audinet-Serville, 1834 accepted as Coleoxestia Aurivillius, 1912 (junior homonym)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Cerambycidae (Family)

Xestocis
 Xestocis Lea, 1913 accepted as Calpurnius Zimmerman, 1994 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Curculionidae (Family)
 Xestocis Casey, 1898 accepted as Cis Latreille, 1796 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Ciidae (Family)

Xestonotellus
 Xestonotellus Reuter, 1905 accepted as Trilaccus Horváth, 1902 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Miridae (Family)
 Xestonotellus Horváth, 1914 accepted as Scopiastella Slater, 1957 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Lygaeidae (Family)

Xestonotus
     Xestonotus Leconte, 1854 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Carabidae (Family)
 Xestonotus Kuwert, 1894 accepted as Stigmatium Gray in Griffith & Pidgeon, 1831 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Cleridae (Family)
 Xestonotus Föerster, 1856 accepted as Leptacis Förster, 1856 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Platygastridae (Family)

Xiadongoceras
 Xiadongoceras Lai & Xu in Zeng Ni, Xu, Zhou, Wang, Li, Lai & Xiang, 1983, nom. nud. (?) † accepted as Xiadongoceras Xu & Lai, 1983 † · Animalia (Kingdom) > Mollusca (Phylum) > Cephalopoda (Class) > Cephalopoda (awaiting allocation) (Order) > Cephalopoda (awaiting allocation) (Family)
     Xiadongoceras Xu & Lai, 1983 † · Animalia (Kingdom) > Mollusca (Phylum) > Cephalopoda (Class) > Cephalopoda (awaiting allocation) (Order) > Cephalopoda (awaiting allocation) (Family)

Xilophagus
 Xilophagus Latreille in Cuvier, 1829 accepted as Xylophagus Meigen, 1803 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Xylophagidae (Family)
 Xilophagus Geinitz, 1845 accepted as Xylophaga Turton, 1822 · Animalia (Kingdom) > Mollusca (Phylum) > Bivalvia (Class) > Myoida (Order) > Pholadidae (Family)

Xinjiangia
     Xinjiangia Hong, 1983 † (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Trichoptera (Order) > Trichoptera (awaiting allocation) (Family)
     Xinjiangia Zhang, 1981 † (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Trilobita (Class) > Trilobita (awaiting allocation) (Order) > Trilobita (awaiting allocation) (Family)
     Xinjiangia Huang & Murayama, 1988 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Lepidoptera (awaiting allocation) (Family)

Xiphidia
     Xiphidia Dallas (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Diptera (awaiting allocation) (Family)
     Xiphidia Coding, 1930 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Membracidae (Family)
 Xiphidia Lepeletier, 1823 accepted as Xiphidia Lepeletier, 1823 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Hymenoptera (awaiting allocation) (Family)

Xiphidion
     Xiphidion Audinet-Serville, 1831 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Orthoptera (Order) > Tettigoniidae (Family)
     Xiphidion Dixon in Sowerby, 1846 † (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Crustacea (awaiting allocation) (Class) > Crustacea (awaiting allocation) (Order) > Crustacea (awaiting allocation) (Family)
     Xiphidion Provancher, 1875 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Hymenoptera (awaiting allocation) (Family)
 Xiphidion Girard, 1858 accepted as Xiphister Jordan, 1880 · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Perciformes (Order) > Stichaeidae (Family)

Xiphidium
 Xiphidium Burmeister, 1838 accepted as Xiphidium Burmeister, 1838 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Orthoptera (Order) > Tettigoniidae (Family)
 Xiphidium Dixon, 1850 † accepted as Xiphidium Dixon, 1850 † · Animalia (Kingdom) > Arthropoda (Phylum) > Crustacea (awaiting allocation) (Class) > Crustacea (awaiting allocation) (Order) > Crustacea (awaiting allocation) (Family)
     Xiphidium Aublet, 1775 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Commelinales (Order) > Haemodoraceae (Family)
 Xiphidium accepted as Xiphidion Girard, 1858 · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Perciformes (Order) > Stichaeidae (Family)

Xiphiozona
 Xiphiozona Berry, 1919 [2] accepted as Leptochiton Gray, 1847 · Animalia (Kingdom) > Mollusca (Phylum) > Polyplacophora (Class) > Lepidopleurida (Order) > Leptochitonidae (Family)
 Xiphiozona Berry, 1919 accepted as Leptochiton Gray, 1847 · Animalia (Kingdom) > Mollusca (Phylum) > Polyplacophora (Class) > Lepidopleurida (Order) > Leptochitonidae (Family)

Xiphistes
     Xiphistes Stål, 1866 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Hemiptera (awaiting allocation) (Family)
 Xiphistes Jordan & Starks, 1895 accepted as Phytichthys Hubbs in Jordan, 1923 · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Perciformes (Order) > Stichaeidae (Family)

Xiphiurus
 Xiphiurus Gaud & Mouchet, 1959 accepted as Gaudiomouchetus Özdikmen, 2008 · Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Astigmata (Order) > Pterolichidae (Family)
     Xiphiurus Smith, 1847 · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Ophidiiformes (Order) > Ophidiidae (Family)

Xiphocaris
     Xiphocaris von Martens, 1872 · Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Decapoda (Order) > Xiphocarididae (Family)
     Xiphocaris Etheridge, Woodward & Jones, 1886 † accepted as Carcinosoma Claypole, 1890 † (junior homonym)· Animalia (Kingdom) > Arthropoda (Phylum) > (Class) > Eurypterida (Order) > Carcinosomatidae (Family)

Xiphocephalus
     Xiphocephalus Théodoridès, 1964 · Chromista (Kingdom) > Miozoa (Phylum) > Gregarinomorphea (Class) > Arthrogregarida (Order) > Stylocephalidae (Family)
 Xiphocephalus Bovallius, 1890 accepted as Rhabdosoma Adams & White, 1849 · Animalia (Kingdom) > Arthropoda (Phylum) > Malacostraca (Class) > Amphipoda (Order) > Oxycephalidae (Family)

Xiphocera
 Xiphocera Macquart, 1834 accepted as Ancylorhynchus Berthold in Latreille, 1827 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Asilidae (Family)
 Xiphocera Burmeister, 1838 accepted as Lamarckiana Kirby, 1910 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Orthoptera (Order) > Pamphagidae (Family)

Xiphochaeta
     Xiphochaeta Mesnil, 1968 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Tachinidae (Family)
     Xiphochaeta Poeppig in Poeppig & Endlicher, 1843 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asterales (Order) > Asteraceae (Family)

Xiphochilus
     Xiphochilus Nardo, 1847 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Pycnogonida (Class) > Pantopoda (Order) > Pantopoda (awaiting allocation) (Family)
 Xiphochilus Bleeker, 1857 accepted as Xiphocheilus Bleeker, 1857 · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Perciformes (Order) > Labridae (Family)

Xiphomyia
     Xiphomyia Townsend, 1917 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Tachinidae (Family)
     Xiphomyia Artemiev, 1991 accepted as Xiphopsathyromyia Ibáñez-Bernal & Marina, 2015 (unavailable name)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Psychodidae (Family)

Xiphonotus
     Xiphonotus Lacordaire, 1854 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Histeridae (Family)
 Xiphonotus Marseul, 1856 accepted as Xiphonotus Lacordaire, 1854 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Histeridae (Family)

Xiphophora
     Xiphophora Montagne, 1842 · Chromista (Kingdom) > Ochrophyta (Phylum) > Phaeophyceae (Class) > Fucales (Order) > Xiphophoraceae (Family)
     Xiphophora Saussure, 1859 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Orthoptera (Order) > Romaleidae (Family)

Xiphophyllum
     Xiphophyllum Beier, 1960 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Orthoptera (Order) > Tettigoniidae (Family)
     Xiphophyllum M.D. Zalessky in M.D. Zalessky & E.F. Tschirkova, 1937 † (uncertain)· Plantae (Kingdom) > Tracheophyta (Phylum) > Pinopsida (Class) > Cordaitales (Order) > Cordaitales (awaiting allocation) (Family)
 Xiphophyllum J.K. Ehrhart, 1789 accepted as Cephalanthera L.C. Richard, 1817 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asparagales (Order) > Orchidaceae (Family)

Xiphoramphus
     Xiphoramphus Blyth, 1843 (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Passeriformes (Order) > Sylviidae (Family)
 Xiphoramphus accepted as Xiphorhamphus Müller & Troschel, 1844 · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Characiformes (Order) > Acestrorhynchidae (Family)

Xiphorhamphus
 Xiphorhamphus Blyth, 1843 accepted as Xiphirhynchus Blyth, 1842 · Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Passeriformes (Order) > Sylviidae (Family)
 Xiphorhamphus Müller & Troschel, 1844 accepted as Acestrorhynchus Eigenmann & Kennedy, 1903 · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Characiformes (Order) > Acestrorhynchidae (Family)

Xiphorhynchus
     Xiphorhynchus Wagler, 1830 (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Reptilia (Class) > Reptilia (awaiting allocation) (Order) > Reptilia (awaiting allocation) (Family)
 Xiphorhynchus Agassiz in Spix & Agassiz, 1829 accepted as Acestrorhynchus Eigenmann & Kennedy, 1903 · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Characiformes (Order) > Acestrorhynchidae (Family)
 Xiphorhynchus Léger, 1893 accepted as Pyxinia Hammerschmidt, 1838 · Chromista (Kingdom) > Miozoa (Phylum) > Gregarinomorphea (Class) > Arthrogregarida (Order) > Actinocephalidae (Family)
     Xiphorhynchus Swainson, 1827 · Animalia (Kingdom) > Chordata (Phylum) > Aves (Class) > Passeriformes (Order) > Dendrocolaptidae (Family)

Xiphosoma
     Xiphosoma Wagler in Spix, 1824 · Animalia (Kingdom) > Chordata (Phylum) > Reptilia (Class) > Squamata (Order) > Boidae (Family)
 Xiphosoma Marshall, 1892 accepted as Eiphosoma Cresson, 1865 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Ichneumonidae (Family)

Xiphostoma
     Xiphostoma Kirby & Spence, 1828 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Hemiptera (awaiting allocation) (Family)
 Xiphostoma Agassiz in Spix & Agassiz, 1829 accepted as Boulengerella Eigenmann, 1903 · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Characiformes (Order) > Ctenoluciidae (Family)

Xiphotheca
     Xiphotheca Ecklon & Zeyher, 1836 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Fabales (Order) > Fabaceae (Family)
     Xiphotheca de Wever in de Wever, Sanfilippo, Riedel & Gruber, 1979 † · Chromista (Kingdom) > Retaria (Phylum) > Polycystinea (Class) > Nassellaria (Order) > Nassellaria (awaiting allocation) (Family)
 Xiphotheca Agassiz, 1846 accepted as Lepidopus Goüan, 1770 · Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Perciformes (Order) > Trichiuridae (Family)

Xiphura
 Xiphura Agassiz, 1846 accepted as Xiphura Agassiz, 1846 · Animalia (Kingdom) > Chordata (Phylum) > Amphibia (Class) > Amphibia (awaiting allocation) (Order) > Amphibia (awaiting allocation) (Family)
     Xiphura Brullé, 1832 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Diptera (awaiting allocation) (Family)
     Xiphura Gray, 1830 (uncertain)· Animalia (Kingdom) > Chordata (Phylum) > Reptilia (Class) > Reptilia (awaiting allocation) (Order) > Reptilia (awaiting allocation) (Family)

Xishania
     Xishania Hong, 1982 † (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Hemiptera (awaiting allocation) (Family)
     Xishania Hu in Chen, Luo, Hu, Yin, Jiang, Wu, Li & Chen, 2002 † (uncertain)· Animalia (Kingdom) > Animalia incertae sedis (Phylum) > (Class) > (Order) > (Family)

Xizangia
     Xizangia D.Y. Hong, 1986 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Lamiales (Order) > Scrophulariaceae (Family)
     Xizangia Zhang, 1988 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Trogidae (Family)
     Xizangia Zhang, 1982 † (uncertain)· Protozoa (Kingdom) > Sarcomastigota (awaiting allocation) (Phylum) > (Class) > (Order) > Sarcomastigota (awaiting allocation) (Family)
     Xizangia Song, Zhu & Zhang, 2004 accepted as Xizangiana Sherwood, Li & Zhang, 2022 (junior homonym)· Animalia (Kingdom) > Arthropoda (Phylum) > Arachnida (Class) > Araneae (Order) > Gnaphosidae (Family)

Xya
     Xya Latreille, 1809 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Orthoptera (Order) > Tridactylidae (Family)
 Xya Herrmannsen, 1849 accepted as Xya Herrmannsen, 1849 · Animalia (Kingdom) > Mollusca (Phylum) > Mollusca (awaiting allocation) (Class) > Mollusca (awaiting allocation) (Order) > Mollusca (awaiting allocation) (Family)

Xylaria
     Xylaria Hill ex Schrank, 1789 · Fungi (Kingdom) > Ascomycota (Phylum) > Sordariomycetes (Class) > Xylariales (Order) > Xylariaceae (Family)
 Xylaria J. Hill ex S.F. Gray, 1821 accepted as Xylaria J. Hill ex S.F. Gray, 1821 · Fungi (Kingdom) > Ascomycota (Phylum) > Ascomycota incertae sedis (Class) > Ascomycota incertae sedis (Order) > Ascomycota incertae sedis (Family)
 Xylaria Hill ex Greville, 1823 accepted as Cordyceps E.M. Fries, 1824 · Fungi (Kingdom) > Ascomycota (Phylum) > Sordariomycetes (Class) > Hypocreales (Order) > Cordycipitaceae (Family)

Xylariopsis
     Xylariopsis Bates, 1884 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Cerambycidae (Family)
 Xylariopsis F.L. Tai, 1934 accepted as Konradia Raciborski, 1900 · Fungi (Kingdom) > Ascomycota (Phylum) > Sordariomycetes (Class) > Hypocreales (Order) > Clavicipitaceae (Family)

Xyleborus
     Xyleborus R.C. Harris & Ladd, 2007 · Fungi (Kingdom) > Ascomycota (Phylum) > Lecanoromycetes (Class) > Lecanorales (Order) > Stereocaulaceae (Family)
     Xyleborus Eichhoff, 1864 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Curculionidae (Family)
 Xyleborus Bowdich, 1825 accepted as Xyleborus Bowdich, 1825 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Buprestidae (Family)

Xylinades
 Xylinades Latreille, 1828 accepted as Xylinada Berthold in Latreille, 1827 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Anthribidae (Family)
 Xylinades Gyllenhal in Schönherr, 1833 accepted as Xylinada Berthold in Latreille, 1827 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Anthribidae (Family)

Xylita
     Xylita Paykull, 1798 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Melandryidae (Family)
 Xylita Redtenbacher, 1858 accepted as Zilora Mulsant, 1856 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Melandryidae (Family)

Xylobius
     Xylobius Guérin in Spinola, 1841 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Cleridae (Family)
 Xylobius Latreille, 1834 accepted as Xylophilus Mannerheim, 1823 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Eucnemidae (Family)
     Xylobius Dawson, 1860 † (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Diplopoda (Class) > Diplopoda (awaiting allocation) (Order) > (Family)

Xyloborus
     Xyloborus Kirby & Spence, 1828 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Coleoptera (awaiting allocation) (Family)
     Xyloborus Dejean, 1834 accepted as Xyloborus Motschulsky, 1858 (nomen nudum)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Tenebrionidae (Family)
 Xyloborus Bedel, 1888 accepted as Xyleborus Eichhoff, 1864 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Curculionidae (Family)
 Xyloborus Motschulsky, 1858 accepted as Rhipidandrus Leconte, 1862 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Tenebrionidae (Family)

Xyloceras
     Xyloceras Zhuravleva, 1978 † (uncertain)· Animalia (Kingdom) > Mollusca (Phylum) > Cephalopoda (Class) > Cephalopoda (awaiting allocation) (Order) > Cephalopoda (awaiting allocation) (Family)
 Xyloceras A.L. Smith, 1901 accepted as Xylobotryum Patouillard, 1895 · Fungi (Kingdom) > Ascomycota (Phylum) > Dothideomycetes (Class) > Dothideomycetes incertae sedis (Order) > Dothideomycetes incertae sedis (Family)

Xylococcus
     Xylococcus Nuttall, 1842 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Ericales (Order) > Ericaceae (Family)
 Xylococcus R. Brown ex J. Britten & S. Moore accepted as Petalostigma F. von Mueller, 1857 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Malpighiales (Order) > Picrodendraceae (Family)
     Xylococcus Loew, 1883 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hemiptera (Order) > Xylococcidae (Family)

Xylodes
     Xylodes Lang & Smith, 1927 † (uncertain)· Animalia (Kingdom) > Cnidaria (Phylum) > Anthozoa (Class) > Stauriida (Order) > Entelophyllidae (Family)
     Xylodes Waterhouse, 1876 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Ptinidae (Family)

Xylodryas
     Xylodryas Turner, 1922 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Geometridae (Family)
 Xylodryas Meyrick, 1925 accepted as Xylodryadella Fletcher, 1940 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Xyloryctidae (Family)

Xyloecus
     Xyloecus Shuckard, 1837 † (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Hymenoptera (awaiting allocation) (Family)
 Xyloecus Dejean, 1833 accepted as Xylophilus Mannerheim, 1823 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Eucnemidae (Family)
 Xyloecus Boisduval & Lacordaire, 1835 accepted as Xylophilus Mannerheim, 1823 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Eucnemidae (Family)

Xylographus
     Xylographus Mellié, 1849 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Ciidae (Family)
     Xylographus Dejean, 1835 accepted as Xylographus Mellié, 1849 (nomen nudum)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Ciidae (Family)

Xylolaemus
     Xylolaemus Dejean, 1835 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Zopheridae (Family)
 Xylolaemus Redtenbacher, 1858 accepted as Xylolaemus Dejean, 1835 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Zopheridae (Family)
 Xylolaemus Reitter, 1882 accepted as Xylolaemus Dejean, 1835 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Zopheridae (Family)

Xyloma
 Xyloma Persoon, 1794 accepted as Rhytisma E.M. Fries, 1818 · Fungi (Kingdom) > Ascomycota (Phylum) > Leotiomycetes (Class) > Rhytismatales (Order) > Rhytismataceae (Family)
     Xyloma Rafinesque, 1837 · Fungi (Kingdom) > Fungi (awaiting allocation) (Phylum) > (Class) > (Order) > (Family)

Xylon
 Xylon O. Kuntze, 1891 accepted as · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Malvales (Order) > Malvaceae (Family)
     Xylon P. Miller, 1754 (uncertain)· Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Malvales (Order) > Malvaceae (Family)
 Xylon Linnaeus, 1758 accepted as Ceiba P. Miller, 1754 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Malvales (Order) > Malvaceae (Family)

Xylonichus
     Xylonichus Boisduval, 1835 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Scarabaeidae (Family)
     Xylonichus Dejean, 1833 accepted as Xylonichus Boisduval, 1835 (nomen nudum)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Scarabaeidae (Family)

Xylopertha
     Xylopertha Guérin-Méneville, 1845 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Bostrichidae (Family)
     Xylopertha Lucas, 1849 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Coleoptera (awaiting allocation) (Family)

Xylophagus
     Xylophagus Link ex Murrill, 1903 (uncertain)· Fungi (Kingdom) > Basidiomycota (Phylum) > Agaricomycetes (Class) > Polyporales (Order) > Meruliaceae (Family)
     Xylophagus Meigen, 1803 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Xylophagidae (Family)
 Xylophagus Link, 1809 accepted as Serpula (Persoon) S.F. Gray, 1821 · Fungi (Kingdom) > Basidiomycota (Phylum) > Agaricomycetes (Class) > Boletales (Order) > Serpulaceae (Family)

Xylophilus
     Xylophilus Willems et al., 1987 · Bacteria (Kingdom) > Proteobacteria (Phylum) > Betaproteobacteria (Class) > Burkholderiales (Order) > Burkholderiales incertae sedis (Family)
     Xylophilus Latreille, 1825 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Aderidae (Family)
     Xylophilus Mannerheim, 1823 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Eucnemidae (Family)
 Xylophilus Curtis, 1830 accepted as Euglenes Westwood, 1830 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Aderidae (Family)

Xylophylla
     Xylophylla Hampson, 1913 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Noctuidae (Family)
 Xylophylla Linnaeus, 1771 accepted as Phyllanthus Linnaeus, 1753 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Malpighiales (Order) > Phyllanthaceae (Family)

Xylorhiza
     Xylorhiza T. Nuttall, 1840 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asterales (Order) > Asteraceae (Family)
 Xylorhiza R.A. Salisbury, 1866 accepted as · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Liliales (Order) > Liliaceae (Family)
     Xylorhiza Dejean, 1835 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Cerambycidae (Family)
 Xylorhiza Laporte, 1840 accepted as Xylorhiza Dejean, 1835 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Cerambycidae (Family)

Xylosphaeria
     Xylosphaeria M.C. Cooke, 1879 · Fungi (Kingdom) > Ascomycota (Phylum) > Ascomycota incertae sedis (Class) > Ascomycota incertae sedis (Order) > Ascomycota incertae sedis (Family)
 Xylosphaeria G.H. Otth, 1869 accepted as Mycothyridium Petrak, 1962 · Fungi (Kingdom) > Ascomycota (Phylum) > Dothideomycetes (Class) > Dothideomycetes incertae sedis (Order) > Dothideomycetes incertae sedis (Family)

Xylospongia
     Xylospongia Gray, 1869 † · Animalia (Kingdom) > Porifera (Phylum) > Hexactinellida (Class) > Lychniscosida (Order) > Lychniscosa (awaiting allocation) (Family)
     Xylospongia Hérenger, 1942 † (uncertain)· Animalia (Kingdom) > Porifera (Phylum) > Porifera (awaiting allocation) (Class) > Porifera (awaiting allocation) (Order) > Porifera (awaiting allocation) (Family)

Xyloterus
     Xyloterus Hartig, 1837 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Hymenoptera (awaiting allocation) (Family)
 Xyloterus Erichson, 1836 accepted as Trypodendron Stephens, 1830 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Curculionidae (Family)

Xylotheca
     Xylotheca Hochstetter, 1843 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Malpighiales (Order) > Achariaceae (Family)
 Xylotheca Reitter, 1897 accepted as Tricorynus Waterhouse, 1849 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Ptinidae (Family)

Xylotrogus
 Xylotrogus Agassiz, 1846 accepted as Thorictus Germar, 1834 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Histeridae (Family)
 Xylotrogus Stephens, 1830 accepted as Lyctus Fabricius, 1792 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Latridiidae (Family)

Xylotrupes
     Xylotrupes Hope, 1837 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Scarabaeidae (Family)
     Xylotrupes Dejean, 1835 accepted as Xylotrupes Dejean, 1835 (nomen nudum)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Bostrichidae (Family)

Xylotrya
     Xylotrya Menke, 1830 (uncertain)· Animalia (Kingdom) > Mollusca (Phylum) > Bivalvia (Class) > Myoida (Order) > Teredinidae (Family)
 Xylotrya Blainville, 1828 accepted as Bankia Gray, 1842 · Animalia (Kingdom) > Mollusca (Phylum) > Bivalvia (Class) > Myoida (Order) > Teredinidae (Family)

Xymenella
     Xymenella Finlay, 1926 · Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Neogastropoda (Order) > Muricidae (Family)
     Xymenella Allan, 1927 accepted as Xymenella Finlay, 1926 (nomen nudum)· Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Neogastropoda (Order) > Muricidae (Family)

Xyphidicera
 Xyphidicera Bigot, 1857 accepted as Xiphidicera Macquart, 1834 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Empididae (Family)
     Xyphidicera Rondani, 1845 accepted as Xiphidicera Macquart, 1834 (unjustified emendation)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Hybotidae (Family)

Xyphocera
 Xyphocera Latreille, 1807 accepted as Paussus Linnaeus, 1775 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Carabidae (Family)
 Xyphocera Bigot, 1857 accepted as Ancylorhynchus Berthold in Latreille, 1827 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Asilidae (Family)
     Xyphocera Rondani, 1845 accepted as Xiphocera Macquart, 1834 (unjustified emendation)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Hybotidae (Family)

Xyphocerus
     Xyphocerus Rafinesque, 1815 accepted as Xyphocerus Rafinesque, 1815 (nomen nudum)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Orthoptera (Order) > Orthoptera (awaiting allocation) (Family)
 Xyphocerus accepted as Ancylorhynchus Berthold in Latreille, 1827 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Asilidae (Family)

Xyridion
     Xyridion (H.G.L. Reichenbach) Klatt, 1872 (uncertain)· Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asparagales (Order) > Iridaceae (Family)
     Xyridion (Tausch) Fourreau, 1869 (uncertain)· Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asparagales (Order) > Iridaceae (Family)

Xyris
 Xyris Adanson, 1763 accepted as Xyris Adanson, 1763 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Asparagales (Order) > Iridaceae (Family)
     Xyris Linnaeus, 1753 · Plantae (Kingdom) > Tracheophyta (Phylum) > Magnoliopsida (Class) > Poales (Order) > Xyridaceae (Family)

Xyroscelis
     Xyroscelis Saunders, 1868 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Buprestidae (Family)
     Xyroscelis Thomson, 1878 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Buprestidae (Family)

Xysta
     Xysta Meigen, 1824 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Tachinidae (Family)
     Xysta Eschscholtz, 1829 accepted as Eleodes Eschscholtz, 1829 (junior homonym)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Tenebrionidae (Family)

Xystonella
     Xystonella Kofoid & Campbell, 1939 (uncertain)· Protozoa (Kingdom) > (Phylum) > Protozoa (awaiting allocation) (Class) > (Order) > (Family)
     Xystonella Brandt, 1907 · Chromista (Kingdom) > Ciliophora (Phylum) > Spirotrichea (Class) > Tintinnida (Order) > Xystonellidae (Family)

Xystonellopsis
     Xystonellopsis Jörgensen, 1924 · Chromista (Kingdom) > Ciliophora (Phylum) > Spirotrichea (Class) > Tintinnida (Order) > Xystonellidae (Family)
     Xystonellopsis Kofoid & Campbell, 1939 (uncertain)· Protozoa (Kingdom) > (Phylum) > Protozoa (awaiting allocation) (Class) > (Order) > (Family)

Xystridura
     Xystridura Whitehouse, 1936 † · Animalia (Kingdom) > Arthropoda (Phylum) > Trilobita (Class) > Redlichiida (Order) > Paradoxididae (Family)
     Xystridura David, 1932 † accepted as Xystridura David, 1932 † (nomen nudum)· Animalia (Kingdom) > Arthropoda (Phylum) > Trilobita (Class) > Trilobita (awaiting allocation) (Order) > Trilobita (awaiting allocation) (Family)

Xystrodus
     Xystrodus Plieninger, 1860 † · Animalia (Kingdom) > Chordata (Phylum) > Chondrichthyes (Class) > Ctenacanthiformes (Order) > Ctenacanthiformes (awaiting allocation) (Family)
 Xystrodus Morris & Roberts, 1862 † accepted as Platyxystrodus Hay, 1899 † · Animalia (Kingdom) > Chordata (Phylum) > Chondrichthyes (Class) > Chondrenchelyiformes (Order) > Chondrenchelyiformes (awaiting allocation) (Family)

Xystrophorus
     Xystrophorus Dejean, 1833 accepted as Clada Pascoe, 1887 (nomen nudum)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Ptinidae (Family)
 Xystrophorus Lesne, 1902 accepted as Clada Pascoe, 1887 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Ptinidae (Family)

Xystropus
 Xystropus Agassiz, 1846 accepted as Systropus Wiedemann, 1820 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Diptera (Order) > Bombyliidae (Family)
     Xystropus Solier, 1835 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Tenebrionidae (Family)

Xystus
     Xystus Hartig in Germar, 1840 (uncertain)· Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Hymenoptera (Order) > Hymenoptera (awaiting allocation) (Family)
     Xystus Schönherr, 1826 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Curculionidae (Family)
 Xystus Fischer de Waldheim, 1829 accepted as Cleogonus Schönherr, 1825 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Coleoptera (Order) > Curculionidae (Family)
 Xystus Grote, 1874 accepted as Prionoxystus Grote, 1882 · Animalia (Kingdom) > Arthropoda (Phylum) > Insecta (Class) > Lepidoptera (Order) > Cossidae (Family)
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