Abyssascidia Herdman, 1880 (additional source)
Agnesia Michaelsen, 1898 accepted as Agnezia Monniot C. & Monniot F., 1991 (source of synonymy)
Agnesia glacialis Michaelsen, 1898 accepted as Agnezia glaciata Michaelsen, 1898 (basis of record)
Agnesiopsis Monniot C., 1969 accepted as Corynascidia Herdman, 1882 (source of synonymy)
Agnezia Monniot C. & Monniot F., 1991 (basis of record)
Agnezia krausei (Michaelsen, 1912) accepted as Agnezia glaciata Michaelsen, 1898 (basis of record)
Agneziidae Monniot C. & Monniot F., 1991 (basis of record)
Alcyonium Pallas, 1766 accepted as Botryllus Gaertner, 1774 (basis of record)
Alleocarpa Michaelsen, 1900 accepted as Alloeocarpa Michaelsen, 1900 (basis of record)
Alleocarpa similis (Sluiter, 1904) accepted as Symplegma brakenhielmi (Michaelsen, 1904) (basis of record)
Amaroecium Milne Edwards, 1841 accepted as Aplidium Savigny, 1816 (basis of record)
Amaroecium constellatum Verrill, 1871 accepted as Aplidium constellatum (Verrill, 1871) (basis of record)
Amaroecium pallidum Verrill, 1871 accepted as Aplidium pallidum (Verrill, 1871) (basis of record)
Amaroecium pellucidum (Leidy, 1855) accepted as Aplidium pellucidum (Leidy, 1855) (basis of record)
Amaroecium stellatum Verrill, 1871 accepted as Aplidium stellatum (Verrill, 1871) (basis of record)
Amaroucium Milne Edwards, 1841 accepted as Aplidium Savigny, 1816 (additional source)
Amaroucium adamsi (Brewin, 1946) accepted as Aplidium adamsi Brewin, 1946 (basis of record)
Amaroucium antarcticum Peres, 1952 accepted as Aplidium peresi Monniot F., 1970 (basis of record)
Amaroucium areolata (Delle Chiaje, 1828) accepted as Aplidium areolatum (Delle Chiaje, 1828) (basis of record)
Amaroucium areolatum (Delle Chiaje, 1828) accepted as Aplidium areolatum (Delle Chiaje, 1828) (basis of record)
Amaroucium caeruleum Sluiter, 1906 accepted as Aplidium cyaneum Monniot C. & Monniot F., 1983 (basis of record)
Amaroucium circumvolutum (Sluiter, 1900) accepted as Aplidium circumvolutum (Sluiter, 1900) (basis of record)
Amaroucium claviforme (Hartmeyer, 1912) accepted as Aplidium claviforme Hartmeyer, 1912 (basis of record)
Amaroucium colleloides Herdman, 1886 accepted as Aplidium colelloides (Herdman, 1886) (basis of record)
Amaroucium conicum (Olivi, 1792) accepted as Aplidium conicum (Olivi, 1792) (basis of record)
Amaroucium diaphanum (Drasche, 1883) accepted as Aplidium diaphanum (Drasche, 1883) (basis of record)
Amaroucium distomoides Herdman, 1898 accepted as Hypsistozoa distomoides (Herdman, 1899) (basis of record)
Amaroucium foliaceum (Sluiter, 1900) accepted as Aplidium foliaceum (Sluiter, 1900) (basis of record)
Amaroucium fuegense (Cunningham, 1871) accepted as Aplidium fuegiense (Cunningham, 1871) (basis of record)
Amaroucium fuegiense (Cunningham, 1871) accepted as Aplidium fuegiense (Cunningham, 1871) (basis of record)
Amaroucium funginum (Sluiter, 1898) accepted as Aplidium funginum (Sluiter, 1898) (basis of record)
Amaroucium kinkaidi Ritter, 1899 accepted as Synoicum jordani (Ritter, 1899) (basis of record)
Amaroucium multiplicatum (Sluiter, 1909) accepted as Aplidium multiplicatum Sluiter, 1909 (basis of record)
Amaroucium nordmani Milne Edwards, 1841 accepted as Aplidium nordmanni (Milne Edwards, 1841) (basis of record)
Amaroucium notti Brewin, 1951 accepted as Aplidium nottii (Brewin, 1951) (basis of record)
Amaroucium obesum (Sluiter, 1898) accepted as Aplidium pantherinum (Sluiter, 1898) (basis of record)
Amaroucium ordinatum (Sluiter, 1906) accepted as Aplidium ordinatum (Sluiter, 1906) (basis of record)
Amaroucium pantherinum (Sluiter, 1898) accepted as Aplidium pantherinum (Sluiter, 1898) (basis of record)
Amaroucium pellucidum (Leidy, 1855) accepted as Aplidium pellucidum (Leidy, 1855) (basis of record)
Amaroucium radiatum (Sluiter, 1906) accepted as Aplidium radiatum (Sluiter, 1906) (basis of record)
Amaroucium roseum Oka, 1927 accepted as Aplidium pliciferum (Redikorzev, 1927) (basis of record)
Amaroucium rotundatum Herdman, 1899 (basis of record)
Amaroucium solidum Ritter & Forsyth, 1917 accepted as Aplidium solidum (Ritter & Forsyth, 1917) (basis of record)
Amaroucium spauldingi (Ritter, 1907) accepted as Aplidium spauldingi (Ritter, 1907) (basis of record)
Amaroucium steineni (Michaelsen, 1907) accepted as Synoicum adareanum (Herdman, 1902) (basis of record)
Amaroucium stelliferum (Sluiter, 1900) accepted as Aplidium stelliferum (Sluiter, 1900) (basis of record)
Amaroucium variabe Herdman, 1886 accepted as Aplidium variabile (Herdman, 1886) (basis of record)
Amaroucium yamazii (Tokioka, 1949) accepted as Aplidium yamazii (Tokioka, 1949) (basis of record)
Amoroecium Milne Edwards, 1841 accepted as Aplidium Savigny, 1816 (basis of record)
Amoroecium constellatum Verrill, 1871 accepted as Aplidium constellatum (Verrill, 1871) (basis of record)
Amoroecium glabrum Verrill, 1871 accepted as Aplidium glabrum (Verrill, 1871) (basis of record)
Amoroecium pallidum Verrill, 1871 accepted as Aplidium pallidum (Verrill, 1871) (basis of record)
Amoroecium pellucidum (Leidy, 1855) accepted as Aplidium pellucidum (Leidy, 1855) (basis of record)
Amoroecium stellatum Verrill, 1871 accepted as Aplidium stellatum (Verrill, 1871) (basis of record)
Amouroecium Milne Edwards, 1841 accepted as Aplidium Savigny, 1816 (basis of record)
Amouroecium glabrum Verrill, 1871 accepted as Aplidium glabrum (Verrill, 1871) (basis of record)
Amouroecium pallidum Verrill, 1871 accepted as Aplidium pallidum (Verrill, 1871) (basis of record)
Amouroucium Milne Edwards, 1841 accepted as Aplidium Savigny, 1816 (basis of record)
Amouroucium glabrum Verrill, 1871 accepted as Aplidium glabrum (Verrill, 1871) (basis of record)
Amouroucium pellucidum (Leidy, 1855) accepted as Aplidium pellucidum (Leidy, 1855) (basis of record)
Amphicarpa agnata (Kott, 1985) accepted as Stolonica agnata Kott, 1985 (basis of record)
Amphicarpa diptycha (Hartmeyer, 1919) accepted as Stolonica diptycha (Hartmeyer, 1919) (basis of record)
Amphicarpa diptychos (Hartmeyer, 1919) accepted as Stolonica diptycha (Hartmeyer, 1919) (basis of record)
Amphicarpa duploplicata (Sluiter, 1913) (basis of record)
Amphicarpa prolifera (Sluiter, 1905) accepted as Stolonica prolifera Sluiter, 1905 (basis of record)
Anadistoma Kott, 1992 (basis of record)
Anomopera Hartmeyer, 1923 (additional source)
Anurella Lacaze-Duthiers, 1877 accepted as Molgula Forbes, 1848 (basis of record)
Anurella bleizi Lacaze-Duthiers, 1877 accepted as Molgula bleizi (Lacaze-Duthiers, 1877) (basis of record)
Anurella macrosiphonica (Kupffer, 1872) accepted as Molgula provisionalis Van Name, 1945 (basis of record)
Anurella oculata (Forbes, 1848) accepted as Molgula oculata Forbes, 1848 (basis of record)
Aplidie Savigny, 1816 accepted as Aplidium Savigny, 1816 (basis of record)
Aplidie cerebriformis Quoy & Gaimard, 1834 accepted as Sycozoa cerebriformis (Quoy & Gaimard, 1834) (basis of record)
Aplidiopsis Lahille, 1890 (additional source)
Aplidiopsis georgianum (Sluiter, 1932) accepted as Synoicum georgianum Sluiter, 1932 (basis of record)
Aplidiopsis pomum (Sars, 1851) accepted as Synoicum pulmonaria (Ellis & Solander, 1786) (basis of record)
Aplidiopsis sphaeroides (Hartmeyer, 1909) accepted as Aplidiopsis pannosum (Ritter, 1899) (basis of record)
Aplidium Savigny, 1816 (additional source)
Aplidium arboratum Kott, 1963 accepted as Aplidium solidum (Ritter & Forsyth, 1917) (basis of record)
Aplidium colleloides (Herdman, 1886) accepted as Aplidium colelloides (Herdman, 1886) (basis of record)
Aplidium crassum Herdman, 1886 accepted as Clavelina picta (Verrill, 1900) (basis of record)
Aplidium distomoides (Herdman, 1899) accepted as Hypsistozoa distomoides (Herdman, 1899) (basis of record)
Aplidium ficus (Alder & Hancock, 1912) accepted as Synoicum pulmonaria (Ellis & Solander, 1786) (basis of record)
Aplidium incrustans (Herdman, 1891) accepted as Aplidium solidum (Ritter & Forsyth, 1917) (basis of record)
Aplidium laevigatum (Herdman, 1886) accepted as Aplidium fuegiense (Cunningham, 1871) (basis of record)
Aplidium notti (Brewin, 1951) accepted as Aplidium nottii (Brewin, 1951) (basis of record)
Aplidium pantherium (Sluiter, 1898) accepted as Aplidium pantherinum (Sluiter, 1898) (basis of record)
Aplidium pedunculatum Quoy & Gaimard, 1834 accepted as Sycozoa pedunculata (Quoy & Gaimard, 1834) (basis of record)
Aplidium protectans (Herdman, 1899) (basis of record)
Aplidium pullum (Sluiter, 1898) accepted as Trididemnum savignii (Herdman, 1886) (basis of record)
Aplidium schaudini Hartmeyer, 1903 accepted as Aplidium schaudinni Hartmeyer, 1903 (basis of record)
Aplidium triggiensis Kott, 1963 accepted as Aplidium triggsense Kott, 1963 (basis of record)
Araneum Monniot C. & Monniot F., 1973 (basis of record)
Archiascidia Julin, 1904 accepted as Pycnoclavella Garstang, 1891 (basis of record)
Archidistoma Garstang, 1891 (additional source)
Archidistoma diaphanes (Ritter & Forsyth, 1917) accepted as Eudistoma diaphanes Ritter & Forsyth, 1917 (basis of record)
Archidistoma diminuta (Kott, 1957) accepted as Pycnoclavella diminuta (Kott, 1957) (basis of record)
Archidistoma diminutum (Kott, 1957) accepted as Pycnoclavella diminuta (Kott, 1957) (basis of record)
Archidistoma molle (Ritter, 1900) accepted as Eudistoma molle (Ritter, 1900) (basis of record)
Archidistoma parva (Sluiter, 1900) accepted as Eudistoma laysani (Sluiter, 1900) (basis of record)