Characteristics
The group includes both colonial and solitary animals. They are distinguished from other sea squirts by the presence of longitudinal vessels in the pharyngeal basket. This provides the etymology of their name: in ancient greek, means "blood vessel". Another characteristic of phlebobranchians is the gonads being surrounded by a loop of gut. The posterior part of the abdomen is absent, and many species also lack the epicardial cavity that surrounds the heart and other internal organs in many other sea squirts.Taxonomy
* ?†Permosomidae ** ?†''Permosoma tunicatum'' Jaekel 1915 [''Sphaerospongia permotessellata'' Parona 1933] * Agneziidae Monniot & Monniot 1991 [Agnesiidae Michaelsen 1898] **''Adagnesia'' Kott 1963 **''Agnezia'' Monniot & Monniot 1991 [''Agnesia'' Michaelsen 1898 non Koninck 1883] **''Caenagnesia'' Ärnbäck-Christie-Linde 1938 **''Proagnesia depressa'' (Millar 1955) **''Pterygascidia'' Sluiter 1904 [''Ciallusia'' Van Name 1918] * Diazonidae'' Garstang 1891 **''Diazona'' Savigny 1816 [''Aphanibranchion'' Oka 1906; ''Syntethys'' Forbes & Goodsir 1851; ''Diagonum'' Troschel 1842; ''Diagoma'' Wade 1842] ** ''Pseudodiazona'' Millar 1963 [''Patridium'' Kott 1975] ** ''Pseudorhopalaea solitaris'' Millar 1975 ** ''Rhopalaea'' Philippi 1843 [''Rhopalona'' Roule 1886; ''Rhopalopsis'' Herdman 1890] ** ''Syndiazona chinensis'' Tokioka 1955 [''Syndiazona'' Oka 1926] ** ''Tylobranchion'' Herdman 1886 * Dimeatidae Sanamyan 2001 ** ''Dimeatus'' Monniot & Monniot 1982 * Hypobythiidae **''Hypobythius'' Moseley 1879 * Octacnemidae ** ''Benthascidia michaelseni'' Ritter 1907 ** ''Cibacapsa gulosa'' Monniot & Monniot 1983 ** ''Cryptia planum'' Monniot & Monniot 1985 ** ''Dicopia'' Sluiter 1905 ** ''Kaikoja'' Monniot 1998 ** ''Megalodicopia'' Oka 1918 ** ''Myopegma'' Monniot & Monniot 2003 ** ''Octacnemus'' Moseley 1877 ** ''Polyoctacnemus patagoniensis'' (Metcalf 1893) Ihle ** ''Situla (tunicate), Situla'' Vinogradova 1969 * Plurellidae Kott 1973 ** ''Microgastra granosa'' (Sluiter 1904) ** ''Plurella'' Kott 1973 * Cionidae Lahille 1887 [incl. ''Pseudodiazona''] **''Araneum'' Monniot & Monniot 1973 ** ''Ciona'' Fleming 1822 ** ''Tantillulum molle'' Monniot & Monniot 1984 * Corellidae Lahille 1888 [Rhodosomatidae Hartmeyer 1908] **''Abyssascidia'' Herdman 1880 **''Chelyosoma'' Broderip & Sowerby 1830 **''Clatripes flaccidus'' Monniot & Monniot 1976 **''Corella (tunicate), Corella'' Alder & Hancock 1870 **''Corelloides molle'' Oka 1926 **''Corellopsis'' Hartmeyer 1903 **''Corynascidia'' Herdman 1882 [''Agnesiopsis'' Monniot 1969] **''Dextrogaster suecica'' Monniot 1962 **''Mysterascidia symmetrica'' Monniot & Monniot 1984 **''Rhodosoma'' Ehrenberg 1828 [''Chevreulius'' Lacaze-Duthiers 1865; ''Corellascidia'' Hartmeyer 1900; ''Peroides'' Macdonald 1864; ''Schizascus'' Stimpson 1855] **''Xenobranchion'' Ärnbäck-Christie-Linde 1950 * Perophoridae Giard 1872 **''Ecteinascidia'' Herdman 1880 [''Perophoropsis'' Lahille 1890; ''Sluiteria''] ** ''Perophora'' Wiegmann 1835 [''Tibiania''] * Ascidiidae Herdman 1882 [incl. ''Namiella'' Monniot & Monniot 1968] **''Ascidia'' Linnaeus 1767 [''Ascidie'' Linnaeus 1767; ''Ascidiopsis'' Verrill 1872; ''Bathyascidia'' Hartmeyer 1901; ''Phallusioides'' Huntsman 1912; ''Tunica''; ''Herdmania'' Hartmeyer 1900 non Lahille 1888 non Thompson 1893;] **''Ascidiella'' Roule 1884 **''Fimbrora calsubia'' Monniot & Monniot 1991 [''Fimbrosa'' Monniot & Monniot 1991] **''Phallusia'' Savigny 1816 [''Pachychlaena'' Hedman 1880; ''Phallusiopsis'' Hartmeyer 1908; ''Plurascidia'' Monniot & Monniot 2000] **''Psammascidia teissieri'' Monniot 1962References
External links
Enterogona Chordate suborders {{Tunicata-stub