• Acetabularia acetabulum (Linnaeus) P.C. Silva, 1952
• Acetabularia antillana (Solms-Laubach) Egerod, 1952
• Acetabularia caliculus J.V. Lamouroux, 1824
• Acetabularia caraibica Kützing, 1856 accepted as Acetabularia crenulata J.V. Lamouroux, 1816
• Acetabularia caribaeum Lamarck, 1816 accepted as Acetabularia crenulata J.V. Lamouroux, 1816
• Acetabularia clavata Yamada, 1934 accepted as
• Acetabularia crenulata J.V. Lamouroux, 1816
• Acetabularia dentata Solms-Laubach, 1895
• Acetabularia denudata Zanardini, 1878 accepted as Acetabularia major G. Martens, 1866
• Acetabularia exigua Solms-Laubach, 1895 accepted as Parvocaulis polyphysoides (P.L. Crouan & H.M. Crouan) S. Berger, U. Fettweiss, S. Gleissberg, L.B. Liddle, U. Richter, H. Sawitzky, H. & G.C. Zuccarello, 2003
• Acetabularia farlowii Solms-Laubach, 1895
• Acetabularia gigas Solms-Laubach, 1895 accepted as Acetabularia major G. Martens, 1866
• Acetabularia haemmerlingii H.G. Schweiger & Berger, 1975
• Acetabularia integra J.V. Lamouroux accepted as Acetabularia acetabulum (Linnaeus) P.C. Silva, 1952
• Acetabularia kilneri J.G. Agardh, 1887
• Acetabularia major G. Martens, 1866
• Acetabularia mediterranea J.V. Lamouroux, 1816 accepted as Acetabularia acetabulum (Linnaeus) P.C. Silva, 1952
• Acetabularia minutissima Okamura, 1912 accepted as
• Acetabularia moebii Solms-Laubach, 1895 accepted as
• Acetabularia myriospora A.B. Joly & Cordeiro-Marina, 1965 accepted as Polyphysa myriospora (A.B. Joly & Cordiero-Marinha) S. Berger & M.J. Kaever, 1992
• Acetabularia parvula Solms-Laubach, 1895 accepted as
• Acetabularia peniculus (R. Brown ex Turner) Solms-Laubach, 1895
• Acetabularia philippinensis Gilbert, 1943 accepted as Acetabularia ryukyuensis Okamura & Yamada, 1932
• Acetabularia polyphysoides P.L. Crouan & H.M. Crouan, 1865 accepted as Parvocaulis polyphysoides (P.L. Crouan & H.M. Crouan) S. Berger, U. Fettweiss, S. Gleissberg, L.B. Liddle, U. Richter, H. Sawitzky, H. & G.C. Zuccarello, 2003
• Acetabularia pusilla (M.A. Howe) F.S. Collins, 1909 accepted as
• Acetabularia roxasii G.C. Trono, A.C. Santiago & E. Ganzon-Fortes, 1978 accepted as Acetabularia ryukyuensis Okamura & Yamada, 1932
• Acetabularia ryukyuensis Okamura & Yamada, 1932
• Acetabularia schenckii K. Möbius, 1889
• Acetabularia suhrii Solms-Laubach, 1895 accepted as accepted as Acetabularia caliculus J.V. Lamouroux, 1824
• Acetabularia toxasii Troño, Santiago & Ganzon-Fortes, 1978
• Acetabularia tsengiana Egerod, 1952 accepted as Parvocaulis exiguus (Solms-Laubach) S. Berger, U. Fettweiss, S. Gleissberg, L.B. Liddle, U. Richter, H. Sawitzky, H. & G.C. Zuccarello, 2003
• Acetabularia velasquezii Troño, Santiago & Ganzon-Fortes, 1978 accepted as
• Acetabularia wettsteinii Schussnig, 1930 accepted as
• Acetabulum caraibicum (Kützing) M.A. Howe, 1901 accepted as Acetabularia crenulata J.V. Lamouroux, 1816
• Acetabulum crenulatum (J.V. Lamouroux) Kuntze, 1891 accepted as Acetabularia crenulata J.V. Lamouroux, 1816
• Acetabulum marinum Tournefort, 1719 accepted as Acetabularia acetabulum (Linnaeus) P.C. Silva, 1952
• Acetabulum mediterraneum Lamarck, 1816 accepted as Acetabularia acetabulum (Linnaeus) P.C. Silva, 1952
• Acetabulum polyphysoides
• Acetabulum pusilla M. Howe accepted as
• Acetabulum pusillum M. Howe, 1909 accepted as Parvocaulis pusillus (M. Howe) S. Berger, U. Fettweiss, S. Gleissberg, L.B. Liddle, U. Richter, H. Sawitzky, H. & G.C. Zuccarello, 2003
• Acicularia alaica Maslov
• Acicularia albrightii Johnson & Kaska
• Acicularia americana Konishi & Epis
• Acicularia antiqua Pia
• Acicularia archiaci L. Morellet & J. Morellet
• Acicularia clapei Jaffrezo
• Acicularia clavata L. Morellet & J. Morellet
• Acicularia comanchense Johnson
• Acicularia cornigera L. Morellet & J. Morellet, 1922 †
• Acicularia dyumatsenae Pia
• Acicularia endoi Praturlon
• Acicularia eocaenica Munier-Chalmas ex L. Morellet & J. Morellet
• Acicularia ferganensis Maslov
• Acicularia gracilis L. Morellet & J. Morellet
• Acicularia guatemalaica Johnson & Kaska
• Acicularia heberti L. Morellet & J. Morellet
• Acicularia indica Varma
• Acicularia intermedia Dragastan
• Acicularia jurassica J.H. Johnson
• Acicularia marginata L. Morellet & J. Morellet
• Acicularia mediopora Munier-Chalmas
• Acicularia michelini Munier-Chalmas ex L. Morellet & J. Morellet
• Acicularia micropora Munier-Chalmas ex L. Morellet & J. Morellet
• Acicularia munieri L. Morellet & J. Morellet
• Acicularia parvula Munier-Chalmas ex L. Morellet & J. Morellet
• Acicularia pavantina d'Archiac, 1846 †
• Acicularia schenckii (K. Möbius) Solms-Laubach, 1895 accepted as Acetabularia schenckii K. Möbius, 1889
• Acicularia shenckii (Möbius) Solms-Laubach, 1895
• Acicularia transylvana Bányai & Morellet
• Aciculella bacillum Pia †
• Aciculella ogilvie-gordonae G.F. Elliott †
• Aciculella preromangica (Praturlon) E. Ott †
• Acroporella assurbanipali G.F. Elliott †
• Acroporella occidentalis Johnson & Kaska †
• Acroporella radoiciciae Praturlon †
• Actinoporella cretacica R. Raineri †
• Actinoporella guembeli A. Alth †
• Actinoporella krymensis V.P. Maslov †
• Actinoporella maslovi A. Praturlon †
• Actinoporella podolica (A. Alth) A. Alth †
• Actinoporella sulcata A. Alth †
• Afghanopolia fragilis Kaever †
• Ajakmalajsoria rotunda Korde †
• Albertaporella involuta Johnson †
• Amgaella amganensis Korde †
• Amicus fortunatus Maslov †
• Amicus orientalis Endo †
• Anatolipora carbonica Konishi †
• Andrusoporella brezovica I. Bystrick †
• Andrusoporella bystrickyi Endo †
• Andrusoporella fusani J. Bystrick †
• Andrusoporella humilis Endo †
• Andrusoporella longobardica Zanin Buri †
• Angioporella bakalovae Conrad & Peybernès †
• Angioporella fouryae Masse, M. Conrad & Radoicic †
• Anisoporella occidentalis Botteron †
• Anthracoporella fragilissima Maslov †
• Anthracoporella kasachiensis Maslov †
• Anthracoporella magnipora Endo †
• Anthracoporella mercurii G.F. Elliott †