URMO Taxon list
Abyssascidia millari Monniot F., 1971
Abyssascidia wyvillii Herdman, 1880
Acalyptophis peronii (Duméril, 1853) accepted as Hydrophis peronii (Duméril, 1853)
Acrochordus arafurae McDowell, 1979
Acrochordus granulatus (Schneider, 1799)
Acrochordus javanicus Hornstedt, 1787
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 cristatella (Pallas, 1769)
Aethia psittacula (Pallas, 1769)
Aethia pusilla (Pallas, 1811)
Aethia pygmaea (Gmelin, 1789)
Agnesiopsis translucida Monniot C., 1969 accepted as Corynascidia translucida (Monniot C., 1969)
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)
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
Alca torda Linnaeus, 1758
Alle alle (Linnaeus, 1758)
Alloeocarpa bacca Ärnbäck, 1929
Alloeocarpa bigyna Monniot C., 1978
Alloeocarpa bridgesi Michaelsen, 1900
Alloeocarpa incrustans (Herdman, 1886)
Alloeocarpa loculosa Monniot C., 1974
Althoffia tumida Lohmann, 1892
Amaroucium snoidgrassi (Ritter, 1899) accepted as Synoicum snodgrassi (Ritter, 1899) accepted as Synoicum kincaidi (Ritter, 1899)
Amblyrhynchus cristatus Bell, 1825
Amphioxus lanceolatus (Pallas, 1774) accepted as Branchiostoma lanceolatum (Pallas, 1774)
Anadistoma attenuatum Kott, 1992
Anomopera ingolfiana Hartmeyer, 1923
Anous minutus Boie, 1844
Anous stolidus (Linnaeus, 1758)
Anous tenuirostris (Temminck, 1823)
Aphrodroma brevirostris (Lesson, 1831)
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
Aplidiopsis pyriformis (Herdman, 1886)
Aplidiopsis sabulosa Kott, 1992
Aplidiopsis stellatus Monniot C. & Monniot F., 1984
Aplidiopsis tokaraensis Tokioka, 1954
Aplidiopsis tubiferus Monniot C., Monniot F., Griffiths & Schleyer, 2001
Aplidiopsis vitreum (Lahille, 1887)
Aplidium abditum Kott, 2006
Aplidium abyssum Kott, 1969
Aplidium acropodium Monniot F. & Gaill, 1978
Aplidium acroporum Kott, 1992
Aplidium aegeaensis (Hartmeyer, 1904)
Aplidium albicans (Milne Edwards, 1841)
Aplidium altarium (Sluiter, 1909)
Aplidium amorphatum Kott, 1963
Aplidium annulatum Sluiter, 1906
Aplidium antarcticum accepted as Aplidium peresi Monniot F., 1970
Aplidium antillense (Gravier, 1955)
Aplidium appendiculatum (Michaelsen, 1923)
Aplidium arenatum (Van Name, 1945)
Aplidium areolatum (Delle Chiaje, 1828)
Aplidium argus (Milne Edwards, 1841) accepted as Morchellium argus (Milne Edwards, 1841)
Aplidium asperum Drasche, 1883
Aplidium aurorae (Harant & Vernières, 1938)
Aplidium australiense Kott, 1963
Aplidium bacculum Kott, 1992
Aplidium balleniae Monniot C. & Monniot F., 1983
Aplidium bermudae (Van Name, 1902)
Aplidium bilinguae Monniot C. & Monniot F., 1983