• Abyssascidia millari Monniot F., 1971
• Abyssascidia pedunculata Sluiter, 1904
• Abyssascidia vasculosa Herdman, 1888 accepted as Ascidia bathybia Hartmeyer, 1922
• Abyssascidia wyvillii Herdman, 1880
• Adagnesia antarctica Kott, 1969
• Adagnesia bifida Millar, 1970
• Adagnesia cautis Monniot C., 1991
• 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 pacifica Sanamyan & Sanamyan, 1998
• 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
• Agnesia arnaudi Monniot C. & Monniot F., 1974 accepted as Agnezia arnaudi (Monniot C. & Monniot F., 1974)
• Agnesia atlantica Monniot C. & Monniot F., 1973 accepted as Agnezia atlantica (Monniot C. & Monniot F., 1973)
• Agnesia beringia Ritter, 1913 accepted as Agnezia septentrionalis (Huntsman, 1912)
• Agnesia biscoei Monniot C. & Monniot F., 1983 accepted as Agnezia biscoei (Monniot C. & Monniot F., 1983)
• Agnesia capensis Millar, 1955 accepted as Agnezia capensis (Millar, 1955)
• Agnesia celtica Monniot C. & Monniot F., 1974 accepted as Agnezia celtica (Monniot C. & Monniot F., 1974)
• Agnesia complicata Kott, 1954 accepted as Caenagnesia bocki Ärnbäck-Christie-Linde, 1938
• Agnesia depressa Millar, 1955 accepted as Proagnesia depressa (Millar, 1955)
• Agnesia glacialis Michaelsen, 1898 accepted as Agnezia glaciata Michaelsen, 1898
• Agnesia glaciata Michaelsen, 1898 accepted as Agnezia glaciata Michaelsen, 1898
• Agnesia himeboja Oka, 1915 accepted as Agnezia himeboja (Oka, 1915)
• Agnesia krausei Michaelsen, 1912 accepted as Agnezia glaciata Michaelsen, 1898
• Agnesia orthenteron Redikorzev, 1941 accepted as Agnezia orthenteron (Redikorzev, 1941)
• Agnesia sabulosa Oka, 1929 accepted as Agnezia himeboja (Oka, 1915)
• Agnesia septentrionalis Huntsman, 1912 accepted as Agnezia septentrionalis (Huntsman, 1912)
• Agnesia tenue Monniot C. & Monniot F., 1983 accepted as Agnezia tenue (Monniot C. & Monniot F., 1983)
• 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 capensis (Millar, 1955)
• Agnezia celtica (Monniot C. & Monniot F., 1974)
• Agnezia glaciata Michaelsen, 1898
• Agnezia himeboja (Oka, 1915)
• Agnezia krausei (Michaelsen, 1912) accepted as 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)
• Alcyonium borlasii Turton, 1807 accepted as Botryllus schlosseri (Pallas, 1766)
• Alcyonium conicum Olivi, 1792 accepted as Aplidium conicum (Olivi, 1792)
• Alcyonium pulmonaria Ellis & Solander, 1786 accepted as Synoicum pulmonaria (Ellis & Solander, 1786)
• Alcyonium schlosseri Pallas, 1766 accepted as Botryllus schlosseri (Pallas, 1766)
• Alleocarpa similis (Sluiter, 1904) accepted as Symplegma brakenhielmi (Michaelsen, 1904)
• Alloeocarpa aequatorialis Millar, 1953
• Alloeocarpa affinis Bovien, 1921
• Alloeocarpa bacca Ärnbäck, 1929
• Alloeocarpa bigyna Monniot C., 1978
• Alloeocarpa bridgesi Michaelsen, 1900
• Alloeocarpa capensis Hartmeyer, 1912
• Alloeocarpa emilionis Michaelsen, 1900 accepted as Alloeocarpa incrustans (Herdman, 1886)
• Alloeocarpa hupferi Michaelsen, 1904 accepted as Distomus hupferi (Michaelsen, 1904)
• Alloeocarpa incrustans (Herdman, 1886)
• Alloeocarpa intermedia Michaelsen, 1900 accepted as Alloeocarpa incrustans (Herdman, 1886)
• Alloeocarpa loculosa Monniot C., 1974
• Alloeocarpa minuta Brewin, 1951
• Alloeocarpa rudentiformis Sluiter, 1915 accepted as Distomus rudentiformis (Sluiter, 1915)
• Alloeocarpa zschaui Michaelsen, 1900 accepted as Alloeocarpa incrustans (Herdman, 1886)
• Althoffia australis Bückmann, 1924 accepted as Pelagopleura australis (Bückmann, 1924)
• Althoffia gracilis Lohmann, 1914 accepted as Pelagopleura gracilis (Lohmann, 1914)
• Althoffia oppressa Lohmann, 1914 accepted as Pelagopleura oppressa (Lohmann, 1914)
• Althoffia pacifica Essenberg, 1926 accepted as Pelagopleura gracilis (Lohmann, 1914)
• Althoffia tumida Lohmann, 1892
• Althoffia verticalis Lohmann, 1914 accepted as Pelagopleura verticalis (Lohmann, 1914)
• Amaroecium constellatum Verrill, 1871 accepted as Aplidium constellatum (Verrill, 1871)
• Amaroecium glabrum Verrill, 1871 accepted as Aplidium glabrum (Verrill, 1871)
• Amaroecium pallidum Verrill, 1871 accepted as Aplidium pallidum (Verrill, 1871)
• Amaroecium pellucidum (Leidy, 1855) accepted as Aplidium pellucidum (Leidy, 1855)
• Amaroecium stellatum Verrill, 1871 accepted as Aplidium stellatum (Verrill, 1871)
• Amaroucium accarense Millar, 1953 accepted as Aplidium accarense (Millar, 1953)
• Amaroucium adamsi (Brewin, 1946) accepted as Aplidium adamsi Brewin, 1946
• Amaroucium aequalisiphonis Ritter & Forsyth, 1917 accepted as Ritterella aequalisiphonis (Ritter & Forsyth, 1917)
• Amaroucium agulhaense Hartmeyer, 1912 accepted as Aplidium agulhaense (Hartmeyer, 1912)
• Amaroucium albicans Milne Edwards, 1841 accepted as Aplidium albicans (Milne Edwards, 1841)
• Amaroucium altarium Sluiter, 1909 accepted as Aplidium altarium (Sluiter, 1909)
• Amaroucium anomalum Herdman, 1899 accepted as Euclavella claviformis (Herdman, 1899)
• Amaroucium antarcticum Herdman, 1910 accepted as Aplidium vastum (Sluiter, 1912)
• Amaroucium antarcticum Peres, 1952 accepted as Aplidium peresi Monniot F., 1970
• Amaroucium antillense Gravier, 1955 accepted as Aplidium antillense (Gravier, 1955)
• Amaroucium arenatum Van Name, 1945 accepted as Aplidium arenatum (Van Name, 1945)
• Amaroucium areolata (Delle Chiaje, 1828) accepted as Aplidium areolatum (Delle Chiaje, 1828)
• Amaroucium areolatum (Delle Chiaje, 1828) accepted as Aplidium areolatum (Delle Chiaje, 1828)
• Amaroucium argus Milne Edwards, 1841 accepted as Morchellium argus (Milne Edwards, 1841)
• Amaroucium astraeoides Sluiter, 1898 accepted as Aplidium flavolineatum (Sluiter, 1898)
• Amaroucium aurorae Harant & Vernières, 1938 accepted as Aplidium aurorae (Harant & Vernières, 1938)
• Amaroucium benhami (Brewin, 1946) accepted as Aplidium benhami (Brewin, 1946)
• Amaroucium bermudae Van Name, 1902 accepted as Aplidium bermudae (Van Name, 1902)
• Amaroucium brementi Harant, 1925 accepted as Aplidium brementi (Harant, 1925)
• Amaroucium caeruleum Sluiter, 1906 accepted as Aplidium cyaneum Monniot C. & Monniot F., 1983
• Amaroucium caliculatum Savigny, 1816 accepted as Aplidium conicum (Olivi, 1792)
• Amaroucium californicum Ritter & Forsyth, 1917 accepted as Aplidium californicum (Ritter & Forsyth, 1917)