Aplidium glabrum (Verrill, 1871) (additional source)
Aplidium pallidum (Verrill, 1871) (additional source)
Ascidia callosa Stimpson, 1852 (additional source)
Ascidia prunum Müller, 1776 (additional source)
Boltenia echinata (Linnaeus, 1767) (additional source)
Boltenia ovifera (Linnaeus, 1767) (additional source)
Bostrichobranchus pilularis (Verrill, 1871) (additional source)
Botrylloides diegense Ritter & Forsyth, 1917 accepted as Botrylloides diegensis Ritter & Forsyth, 1917 (additional source)
Botryllus schlosseri (Pallas, 1766) (additional source)
Ciona intestinalis (Linnaeus, 1767) (additional source)
Cnemidocarpa mollis (Stimpson, 1852) (additional source)
Dendrodoa carnea (Agassiz, 1850) (additional source)
Dendrodoa grossularia (Van Beneden, 1846) (additional source)
Dendrodoa pulchella (Rathke, 1806) (additional source)
Didemnum albidum (Verrill, 1871) (additional source)
Distaplia clavata (Sars, 1851) (additional source)
Halocynthia pyriformis (Rathke, 1806) (additional source)
Lissoclinum aureum Verrill, 1871 (additional source)
Molgula arenata Stimpson, 1852 (additional source)
Molgula citrina Alder & Hancock, 1848 (additional source)
Molgula complanata Alder & Hancock, 1870 (additional source)
Molgula manhattensis (De Kay, 1843) (additional source)
Molgula retortiformis Verrill, 1871 (additional source)
Molgula siphonalis Kiaer, 1896 (additional source)
Polycarpa fibrosa (Stimpson, 1852) (additional source)
Styela coriacea (Alder & Hancock, 1848) (additional source)
Styela partita (Stimpson, 1852) accepted as Styela canopus (Savigny, 1816) (additional source)
Trididemnum tenerum (Verrill, 1871) (additional source)

Cobscook Bay for Aplidium glabrum (Verrill, 1871) 
Cobscook Bay for Aplidium pallidum (Verrill, 1871) 
Cobscook Bay for Ascidia callosa Stimpson, 1852 
Cobscook Bay for Ascidia prunum Müller, 1776 
Cobscook Bay for Boltenia echinata (Linnaeus, 1767) 
Cobscook Bay for Boltenia ovifera (Linnaeus, 1767) 
Cobscook Bay for Bostrichobranchus pilularis (Verrill, 1871) 
Cobscook Bay for Botrylloides diegense Ritter & Forsyth, 1917 
Cobscook Bay for Botryllus schlosseri (Pallas, 1766) 
Cobscook Bay for Ciona intestinalis (Linnaeus, 1767) 
Cobscook Bay for Cnemidocarpa mollis (Stimpson, 1852) 
Cobscook Bay for Dendrodoa carnea (Agassiz, 1850) 
Cobscook Bay for Dendrodoa grossularia (Van Beneden, 1846) 
Cobscook Bay for Dendrodoa pulchella (Rathke, 1806) 
Cobscook Bay for Didemnum albidum (Verrill, 1871) 
Cobscook Bay for Distaplia clavata (Sars, 1851) 
Cobscook Bay for Halocynthia pyriformis (Rathke, 1806) 
Cobscook Bay for Lissoclinum aureum Verrill, 1871 
Cobscook Bay for Molgula arenata Stimpson, 1852 
Cobscook Bay for Molgula citrina Alder & Hancock, 1848 
Cobscook Bay for Molgula complanata Alder & Hancock, 1870 
Cobscook Bay for Molgula manhattensis (De Kay, 1843) 
Cobscook Bay for Molgula retortiformis Verrill, 1871 
Cobscook Bay for Molgula siphonalis Kiaer, 1896 
Cobscook Bay for Polycarpa fibrosa (Stimpson, 1852) 
Cobscook Bay for Styela coriacea (Alder & Hancock, 1848) 
Cobscook Bay for Styela partita (Stimpson, 1852) 
Cobscook Bay for Trididemnum tenerum (Verrill, 1871) 
United States part of the North Atlantic Ocean for Styela canopus (Savigny, 1816)  (origin: alien)