Aa Baker, 1940 accepted as Philonesia Sykes, 1900 (basis of record)
Aa Baker, 1940 accepted as Philonesia Sykes, 1900 (name verified source)
Aaaba de Laubenfels, 1936 accepted as Crellastrina Topsent, 1927 (name verified source)
Aaadonta Solem, 1976 (basis of record)
Aaadonta Solem, 1976 (name verified source)
Aaages Barovskiĭ, 1926 (basis of record)
Aaages Barovskiĭ, 1926 (name verified source)
Aaata Semenov, 1906 (basis of record)
Aaata Semenov, 1906 (name verified source)
Aaata de Laubenfels, 1930 accepted as Clathria Schmidt, 1862 (basis of record)
Aaata de Laubenfels, 1930 accepted as Clathria Schmidt, 1862 (name verified source)
Aaba de Laubenfels, 1936 accepted as Crellastrina Topsent, 1927 (basis of record)
Aaba de Laubenfels, 1936 accepted as Crellastrina Topsent, 1927 (name verified source)
Aabacharis Schauff, 1991 accepted as Eprhopalotus Girault, 1916 (basis of record)
Aabacharis Schauff, 1991 accepted as Eprhopalotus Girault, 1916 (name verified source)
Aacanthocnema Tuthill & Taylor, 1955 (basis of record)
Aacanthocnema Tuthill & Taylor, 1955 (name verified source)
Aachenosaurus Smets, 1887 † accepted as Aachenoxylon M. Hovelacque, 1889 † (basis of record)
Aachenosaurus Smets, 1887 † accepted as Aachenoxylon M. Hovelacque, 1889 † (name verified source)
Aackia Yosii, 1966 (basis of record)
Aackia Yosii, 1966 (name verified source)
Aacocrinus Bowsher, 1955 † (basis of record)
Aacocrinus Bowsher, 1955 † (name verified source)
Aades Schönherr, 1823 (basis of record)
Aades Schönherr, 1823 (name verified source)
Aagaardia Sæther, 2000 (basis of record)
Aagaardia Sæther, 2000 (name verified source)
Aaglaocrinus Webster, 1981 † (basis of record)
Aaglaocrinus Webster, 1981 † (name verified source)
Aaka Dworakowska, 1972 (basis of record)
Aaka Dworakowska, 1972 (name verified source)
Aalatettix Zheng & Mao, 2002 (basis of record)
Aalatettix Zheng & Mao, 2002 (name verified source)
Aaleniella Conti & Fischer, 1981 † (basis of record)
Aaleniella Conti & Fischer, 1981 † (name verified source)
Aalenilla Phemhoff, 1963 † accepted as Aaleniella Plumhoff, 1963 † (basis of record)
Aalenilla Phemhoff, 1963 † accepted as Aaleniella Plumhoff, 1963 † (extant flag source)
Aalenirhynchia Shi & Grant, 1993 † (basis of record)
Aalenirhynchia Shi & Grant, 1993 † (name verified source)
Aancistroger Bei-Bienko, 1957 (basis of record)
Aancistroger Bei-Bienko, 1957 (name verified source)
Aaptolasma Newman & Ross, 1971 accepted as Hexelasma Hoek, 1913 (basis of record)
Aaptolasma Newman & Ross, 1971 accepted as Hexelasma Hoek, 1913 (name verified source)
Aaptoryctes Gingerich, 1982 † (basis of record)
Aaptoryctes Gingerich, 1982 † (name verified source)
Aaptos Gray, 1867 (basis of record)
Aaptos Gray, 1867 (name verified source)
Aaptosyax Rainboth, 1991 (basis of record)
Aaptosyax Rainboth, 1991 (name verified source)
Aaptotoichus Loeblich & Tappan, 1982 † (basis of record)
Aaptotoichus Loeblich & Tappan, 1982 † (name verified source)
Aaptus Richmond, 1902 (basis of record)
Aaptus Richmond, 1902 (name verified source)
Aarchaeocidaris Webster, 1997 † accepted as Palaechinus McCoy, 1844 † (basis of record)
Aarchaeocidaris Webster, 1997 † accepted as Palaechinus McCoy, 1844 † (name verified source)
Aarchaeocidaris Webster, 1997 † accepted as Palaechinus McCoy, 1844 † (extant flag source)
Aargaunota Montfort, 1810 accepted as Argonauta Linnaeus, 1758 (basis of record)
Aargaunota Montfort, 1810 accepted as Argonauta Linnaeus, 1758 (source of synonymy)
Aargaunota Montfort, 1810 accepted as Argonauta Linnaeus, 1758 (name verified source)
Aaronia A. H. Verrill, 1950 accepted as Muricanthus Swainson, 1840 accepted as Hexaplex Perry, 1810 (basis of record)
Aaronia A. H. Verrill, 1950 accepted as Muricanthus Swainson, 1840 accepted as Hexaplex Perry, 1810 (name verified source)
Aaroniella Mockford, 1952 (basis of record)
Aaroniella Mockford, 1952 (name verified source)
Aartsenia Warén, 1991 (basis of record)
Aartsenia Warén, 1991 (name verified source)
Aatocrinus Moore & Plummer, 1940 † (basis of record)
Aatocrinus Moore & Plummer, 1940 † (name verified source)
Aatolana Bruce, 1993 (basis of record)
Aatolana Bruce, 1993 (name verified source)
Aayemenaytcheia Lieberman, 1994 † (basis of record)
Aayemenaytcheia Lieberman, 1994 † (name verified source)
Aayemenaytcheia Lieberman, 1994 † (extant flag source)
Ababa Casey, 1897 (basis of record)
Ababa Casey, 1897 (name verified source)
Ababactus Sharp, 1885 accepted as Ochthephilum Stephens, 1829 (basis of record)
Ababactus Sharp, 1885 accepted as Ochthephilum Stephens, 1829 (name verified source)
Ababes Gray, 1842 (basis of record)
Ababes Gray, 1842 (name verified source)
Abablemma Nye, 1975 (basis of record)
Abablemma Nye, 1975 (name verified source)
Abacaelostus Straneo, 1952 (basis of record)
Abacaelostus Straneo, 1952 (name verified source)
Abacantha Hall, 1938 (basis of record)
Abacantha Hall, 1938 (name verified source)
Abacaria Mosely, 1941 (basis of record)
Abacaria Mosely, 1941 (name verified source)
Abacarioides Marlier, 1961 (basis of record)
Abacarioides Marlier, 1961 (name verified source)
Abacarus Keifer, 1944 (basis of record)
Abacarus Keifer, 1944 (name verified source)
Abacella Stechow, 1920 (basis of record)
Abacella Stechow, 1920 (name verified source)
Abacena Walker, 1865 (basis of record)
Abacena Walker, 1865 (name verified source)
Abacetillus Straneo, 1943 accepted as Abacetus Dejean, 1828 (basis of record)
Abacetillus Straneo, 1943 accepted as Abacetus Dejean, 1828 (name verified source)
Abacetodes Straneo, 1939 accepted as Phimus Péringuey, 1926 (basis of record)
Abacetodes Straneo, 1939 accepted as Phimus Péringuey, 1926 (name verified source)
Abacetus Dejean, 1828 (basis of record)
Abacetus Dejean, 1828 (name verified source)

 Taxonomic remark

 for Acanthascus Schulze, 1885

Unavailable name (nomen nudum). [details]

 Taxonomic remark

 for Acantholophus Dejean, 1834

In Nomenclator Zoologicus, the valid publication for this taxon is given as "(Schoenherr MS.) Guérin-Ménéville ... [details]

 Taxonomic remark

 for Aeluropsis Emeljanov, 1971

Junior homonym of Aeluropsis Lydekker, 1884 (fossil mammal); replacement name is Bubastia Emelyanov, 1975. [details]

 Taxonomic remark

 for Anagonia Ameghino, 1904 †

Listed as an accepted genus in McKenna & Bell, 1997 and in the Paleobiology Database (2022 version), however a ... [details]

 Taxonomic remark

 for Areyonga Young, 1997 †

Junior homonym of Areyonga Gauld, 1984 (Hymenoptera); replacement name is Areyongalepis Young, 2000. [details]

 Taxonomic remark

 for Chrysocapsa Pascher, 1912

A nomen nudum according to Nomenclator Zoologicus; valid publication dates from Pascher, 1913. [details]

 Taxonomic remark

 for Dialembryon Iredale, 1939, nom. nud. [2]

Listed as validly published in Nomenclator Zoologicus, however a nomen nudum according to Köhler & Bouchet, 2020. ... [details]

 Taxonomic remark

 for Eocephalodiscus Kozlowski, 1938 †

Unavailable name (nomen nudum). [details]

 Taxonomic remark

 for Euestheria Depéret & Mazeran, 1912 †

As Isaura (Euestheria, = "true Estheria"); elevated to genus by Raymond, 1946. According to Nomenclator Zoologicus, ... [details]

 Taxonomic remark

 for Fucoides A.T. Brongniart, 1828 †

Name and publication details as listed in Neave, however this appears to be almost certainly a later usage of ... [details]

 Taxonomic remark

 for Gonioclymenia Wedekind, 1908 †

Listed as a new name ("[non Hyatt]") in Nomenclator Zoologicus, but appears to be a later usage, see e.g. ... [details]

 Taxonomic remark

 for Guilielmia [misspelling]

Misspelling in Nomenclator Zoologicus / Zoological Record [details]

 Taxonomic remark

 for Haeckelina Mereschkowsky, 1877

Year given as 1879, publication as Arch. Mikroskop. Anat. 16: 211 in Nomenclator Zoologicus, however that work was ... [details]

 Taxonomic remark

 for Halliosca de Souza Lopes, 1975

Incorrectly flagged as fossil (extinct) in online version of Nomenclator Zoologicus. [details]

 Taxonomic remark

 for Hypereuryntis Neave, 1939

Name given in Neave, 1939, Nomenclator Zoologus, as "Hypereuryntis Meyrick 1915, Trans. N. Zealand Inst., 47, 221 ... [details]

 Taxonomic remark

 for Lindbergocapsus Wagner, 1961 [2]

Published November 1961; junior homonym of Lindbergocapsus Wagner 1961 (January), Notul. ent. 40: 112; replacement name is ... [details]

 Taxonomic remark

 for Lyonsiella G.O. Sars, 1868

Unavailable name (nomen nudum). [details]

 Taxonomic remark

 for Microcomatula Clark, 1911

Unavailable name (nomen nudum). [details]

 Taxonomic remark

 for Mimacalolepta Breuning, 1976

Cf. Mimacalolepta Breuning, 1976, Revue Zool. afr. 90: 482 (different taxon), latter now Mimacaloleptoides ... [details]

 Taxonomic remark

 for Noetia Gray, 1840

Unavailable name (nomen nudum). [details]

 Taxonomic remark

 for Paraspinaria Cameron, 1905 [2]

Publication date is given in Nomen. Zool. as October 1905. A junior homonym of Paraspinaria Cameron 1905, Trans. S. ... [details]

 Taxonomic remark

 for Paraspinaria Cameron, 1905

Publication date is given in Nomen. Zool. as January 1905, cf. Paraspinaria Cameron 1905, Spolia zeylan., 3, 88 ... [details]

 Taxonomic remark

 for Plesiophyllia Koby, 1884 †

Junior homonym of Plesiophyllia Michelotti, 1871 (Faviidae). [details]

 Taxonomic remark

 for Pseudoscymnus Chapin, 1962

Junior homonym of Pseudoscymnus Herre, 1935 (Chondrichthyes); replacement name is Sasajiscymnus Vandenberg, 2004. [details]

 Taxonomic remark

 for Sabatinca Walker, 1863

Misspelled "Sabatinea" in online version of Nomenclator Zoologicus (OCR error). [details]

 Taxonomic remark

 for Sabia Gray, 1841

Listed as a nomen nudum in Nomenclator Zoologicus (with a subsequent valid publication by Reeve, 1842), however the ... [details]

 Taxonomic remark

 for Thalassoplancta Haeckel, 1867

Non Thalassoplancta Haeckel, 1862 or 1881. See Thalassorhaphis Campbell, 1951 (Nomen. Zool.). [details]

 Taxonomic remark

 for Zirfaea Gray, 1840

Unavailable name (nomen nudum). [details]