Aplidium Savigny, 1816 (basis of record)
Aplidium glabrum (Verrill, 1871) (basis of record)
Aplidium mutabile (Sars, 1851) (basis of record)
Aplidium pallidum (Verrill, 1871) (basis of record)
Aplidium spitzbergense Hartmeyer, 1903 (basis of record)
Aplousobranchia (basis of record)
Asajirus arcticus (Hartmeyer, 1923) (basis of record)
Ascidia Linnaeus, 1767 (basis of record)
Ascidia callosa Stimpson, 1852 (basis of record)
Ascidia dijmphniana (Traustedt, 1886) (basis of record)
Ascidia obliqua Alder, 1863 (basis of record)
Ascidia prunum Müller, 1776 (basis of record)
Ascidiidae Herdman, 1882 (additional source)
Boltenia Savigny, 1816 (basis of record)
Boltenia echinata (Linnaeus, 1767) (basis of record)
Boltenia ovifera (Linnaeus, 1767) (basis of record)
Botrylloides Milne Edwards, 1841 (basis of record)
Chelyosoma Broderip & Sowerby, 1830 (basis of record)
Chelyosoma macleayanum Broderip & Sowerby, 1830 (basis of record)
Ciona Fleming, 1822 (basis of record)
Ciona intestinalis (Linnaeus, 1767) (basis of record)
Cionidae Lahille, 1887 (basis of record)
Cnemidocarpa Huntsman, 1913 (basis of record)
Cnemidocarpa finmarkiensis (Kiaer, 1893) (basis of record)
Cnemidocarpa mollis (Stimpson, 1852) (basis of record)
Cnemidocarpa rhizopus (Redikorzev, 1907) (basis of record)
Corella Alder & Hancock, 1870 (basis of record)
Corella borealis Traustedt, 1886 (basis of record)
Corellidae Lahille, 1888 (additional source)
Corellopsis Hartmeyer, 1903 (basis of record)
Corellopsis pedunculata Hartmeyer, 1903 (basis of record)
Dendrodoa MacLeay, 1824 (basis of record)
Dendrodoa aggregata Müller, 1776 (basis of record)
Dendrodoa carnea (Agassiz, 1850) (basis of record)
Dendrodoa grossularia (Van Beneden, 1846) (basis of record)
Dendrodoa pulchella (Rathke, 1806) (basis of record)
Didemnidae Giard, 1872 (basis of record)
Didemnum Savigny, 1816 (basis of record)
Didemnum albidum (Verrill, 1871) (basis of record)
Distaplia Della Valle, 1881 (basis of record)
Distaplia clavata (Sars, 1851) (basis of record)
Eudistoma Caullery, 1909 (basis of record)
Eudistoma vitreum (Sars, 1851) (basis of record)
Eugyra Alder & Hancock, 1870 (additional source)
Halocynthia Verrill, 1879 (basis of record)
Halocynthia pyriformis (Rathke, 1806) (basis of record)
Hexacrobylidae Seeliger, 1906 accepted as Molgulidae Lacaze-Duthiers, 1877 (additional source)
Kukenthalia Hartmeyer, 1903 (basis of record)
Kukenthalia borealis (Gottschaldt, 1894) (basis of record)
Leptoclinides Bjerkan, 1905 (basis of record)
Leptoclinides faeroensis Bjerkan, 1905 (basis of record)
Lissoclinum Verrill, 1871 (basis of record)
Lissoclinum aureum Verrill, 1871 (basis of record)
Microcosmus Heller, 1877 (basis of record)
Microcosmus glacialis (Sars, 1859) (basis of record)
Molgula Forbes, 1848 (basis of record)
Molgula citrina Alder & Hancock, 1848 (basis of record)
Molgula complanata Alder & Hancock, 1870 (basis of record)
Molgula manhattensis (De Kay, 1843) (basis of record)
Molgula retortiformis Verrill, 1871 (basis of record)
Molgula romeri Hartmeyer, 1903 (basis of record)
Molgula siphonalis Kiaer, 1896 (basis of record)
Molgulidae Lacaze-Duthiers, 1877 (additional source)
Pelonaia Forbes & Goodsir, 1841 (basis of record)
Pelonaia corrugata Goodsir & Forbes, 1841 (basis of record)
Phlebobranchia (basis of record)
Polycarpa Heller, 1877 (basis of record)
Polycarpa fibrosa (Stimpson, 1852) (basis of record)
Polycitor [Renier], [1804] (basis of record)
Polycitoridae Michaelsen, 1904 (additional source)
Polyclinidae Milne Edwards, 1841 (additional source)
Pyuridae Hartmeyer, 1908 (additional source)
Stolidobranchia (basis of record)
Styela Fleming, 1822 (basis of record)
Styela coriacea (Alder & Hancock, 1848) (basis of record)
Styela gelatinosa (Traustedt, 1886) (basis of record)
Styela rustica Linnaeus, 1767 (basis of record)
Styelidae Herdman, 1881 (additional source)
Synoicum Phipps, 1774 (basis of record)
Synoicum pulmonaria (Ellis & Solander, 1786) (basis of record)
Trididemnum Della Valle, 1881 (basis of record)
Trididemnum tenerum (Verrill, 1871) (basis of record)