URMO Taxon list
Abyssascidia Herdman, 1880
Abyssascidia millari Monniot F., 1971
Abyssascidia wyvillii Herdman, 1880
Acalyptophis Boulenger, 1896
Acalyptophis peronii (Duméril, 1853) accepted as Hydrophis peronii (Duméril, 1853)
Acrochordidae
Acrochordus Hornstedt, 1787
Acrochordus arafurae McDowell, 1979
Acrochordus granulatus (Schneider, 1799)
Acrochordus javanicus Hornstedt, 1787
Actinopteri
Actinopterygii
Adagnesia Kott, 1963
Adagnesia antarctica Kott, 1969
Adagnesia charcoti Monniot C. & Monniot F., 1973
Adagnesia fissa Monniot F. & Monniot C., 1976
Adagnesia henriquei Monniot C. & Monniot F., 1983
Adagnesia opaca Kott, 1963
Adagnesia rimosa Monniot C. & Monniot F., 1974
Adagnesia venusta Kott, 1985
Adagnesia vesiculiphora Nishikawa, 1982
Adagnesia vesicullophora Nishikawa, 1982 accepted as Adagnesia vesiculiphora Nishikawa, 1982
Adagnesia weddelli Monniot C. & Monniot F., 1994
Aethia Merrem, 1788
Aethia cristatella (Pallas, 1769)
Aethia psittacula (Pallas, 1769)
Aethia pusilla (Pallas, 1811)
Aethia pygmaea (Gmelin, 1789)
Agnesiopsis Monniot C., 1969 accepted as Corynascidia Herdman, 1882
Agnesiopsis translucida Monniot C., 1969 accepted as Corynascidia translucida (Monniot C., 1969)
Agnezia Monniot C. & Monniot F., 1991
Agnezia abyssa Sanamyan & Sanamyan, 2002
Agnezia arnaudi (Monniot C. & Monniot F., 1974)
Agnezia atlantica (Monniot C. & Monniot F., 1973)
Agnezia biscoei (Monniot C. & Monniot F., 1983)
Agnezia celtica (Monniot C. & Monniot F., 1974)
Agnezia glaciata Michaelsen, 1898
Agnezia monnioti Young & Vazquez, 1997
Agnezia orthenteron (Redikorzev, 1941)
Agnezia sabulosa (Redikorzev, 1941)
Agnezia septentrionalis (Huntsman, 1912)
Agnezia tenue (Monniot C. & Monniot F., 1983)
Agneziidae Monniot C. & Monniot F., 1991
Aipysurus Lacepède, 1804
Aipysurus apraefrontalis Smith, 1926
Aipysurus duboisii Bavay, 1869
Aipysurus eydouxi Gray, 1849
Aipysurus foliosquama Smith, 1926
Aipysurus fuscus Tschudi, 1837
Aipysurus laevis Lacépède, 1804
Aipysurus laevis pooleorum Smith, 1974
Aipysurus pooleorum Smith, 1974 accepted as Aipysurus laevis pooleorum Smith, 1974
Aipysurus tenuis Lönnberg & Andersson, 1913
Alabiata Fenaux, 1993
Alca Linnaeus, 1758
Alca torda Linnaeus, 1758
Alcidae Leach, 1820
Alethinophidia
Alle Link, 1806
Alle alle (Linnaeus, 1758)
Alloeocarpa Michaelsen, 1900
Alloeocarpa bacca Ärnbäck, 1929
Alloeocarpa bigyna Monniot C., 1978
Alloeocarpa bridgesi Michaelsen, 1900
Alloeocarpa incrustans (Herdman, 1886)
Alloeocarpa loculosa Monniot C., 1974
Althoffia Lohmann, 1892
Althoffia tumida Lohmann, 1892
Amaroucium Milne Edwards, 1841 accepted as Aplidium Savigny, 1816
Amaroucium snoidgrassi (Ritter, 1899) accepted as Synoicum snodgrassi (Ritter, 1899) accepted as Synoicum kincaidi (Ritter, 1899)
Amblyrhynchus
Amblyrhynchus cristatus Bell, 1825
Amphioxus Yarrell, 1836 accepted as Branchiostoma Costa, 1834
Amphioxus lanceolatus (Pallas, 1774) accepted as Branchiostoma lanceolatum (Pallas, 1774)
Anadistoma Kott, 1992
Anadistoma attenuatum Kott, 1992
Anomopera Hartmeyer, 1923
Anomopera ingolfiana Hartmeyer, 1923
Anous Stephens, 1826
Anous minutus Boie, 1844
Anous stolidus (Linnaeus, 1758)
Anous tenuirostris (Temminck, 1823)
Aphanibranchion Oka, 1906 accepted as Diazona Savigny, 1816
Aphrodroma Olson, 2000
Aphrodroma brevirostris (Lesson, 1831)
Aplidiopsis Lahille, 1890
Aplidiopsis amoyense Tokioka, 1967
Aplidiopsis arenosum Sluiter, 1898 accepted as Polyclinum arenosum (Sluiter, 1898)
Aplidiopsis atlanticus Monniot F., 1975
Aplidiopsis confluata Kott, 1992
Aplidiopsis discoveryi Millar, 1960
Aplidiopsis gelidus Monniot F., 1987
Aplidiopsis georgianum (Sluiter, 1932) accepted as Synoicum georgianum Sluiter, 1932
Aplidiopsis helenae Redikorzev, 1927
Aplidiopsis indicus Monniot F. & Monniot C., 2006
Aplidiopsis macroglossum (Hartmeyer, 1919) accepted as Synoicum macroglossum (Hartmeyer, 1919)
Aplidiopsis mammillata Kott, 1992
Aplidiopsis ocellatus Monniot F. & Monniot C., 1996
Aplidiopsis pannosum (Ritter, 1899)
Aplidiopsis parvastigma Monniot C. & Monniot F., 1991