Phlebobranchia is a suborder of sea squirts in the class Ascidiacea.
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, φλέψς, φλεβός 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.
?†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; Angesia (sic) Ritter 1913]
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; Synthetis (sic) Huxley 1857; Synthethys (sic) Della Valle 1908; Diacona (sic) Reichenbach 1828; Diagonum Troschel 1842; Diagoma Wade 1842; Diazone (sic) Usov 1875]
Pseudodiazona Millar 1963 [Patridium Kott 1975]
Pseudorhopalaea solitaris Millar 1975
Rhopalaea Philippi 1843 [Rhopalona Roule 1886; Rhopalana (sic) Lahille 1886; Rhopalia (sic) Norman 1897; Rophalea (sic) Hartmeyer 1909; Rhopalopsis Herdman 1890]
Syndiazona chinensis Tokioka 1955 [Syndiazona Oka 1926]
Tylobranchion Herdman 1886 [Tylobrachion (sic) Pfeffer 1890; Tylobranchium (sic) Perrier 1899; Tylobronchion (sic) Seeliger 1907]
Dimeatidae Sanamyan 2001
Dimeatus Monniot & Monniot 1982
Hypobythiidae
Hypobythius Moseley 1879 [Hypobythus (sic) Walther 1893]
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 Vinogradova 1969
Plurellidae Kott 1973
Microgastra granosa (Sluiter 1904)
Plurella Kott 1973
Cionidae Lahille 1887 [incl. Pseudodiazona]
Araneum Monniot & Monniot 1973
Ciona Fleming 1822 [Cliona (sic) Agassiz 1846; Cione (sic) Verrill 1872; Cionea (sic) Weismann 1882; Cionia (sic) Racovitza 1892; Cyone (sic) Danilewsky 1892; Cyona (sic) Marage 1905]
Tantillulum molle Monniot & Monniot 1984
Corellidae Lahille 1888 [Rhodosomatidae Hartmeyer 1908]
Abyssascidia Herdman 1880
Chelyosoma Broderip & Sowerby 1830 [Chelisoma (sic) Swainson 1840; Chelysoma (sic) Gravenhorst 1843; Cheliosoma (sic) Redikorzev 1910; Chelyozoma (sic) Redikorzev 1911]
Clatripes flaccidus Monniot & Monniot 1976
Corella Alder & Hancock 1870
Corelloides molle Oka 1926
Corellopsis Hartmeyer 1903 [Correllopsis (sic) Schepotieff 1911]
Corynascidia Herdman 1882 [Agnesiopsis Monniot 1969; Corinascidia (sic) Agassiz 1892; Coryanascidia (sic) Ritter 1907; Chorynascidia (sic) Ritter 1912]
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; Rhodosema (sic) Paetel 1875]
Xenobranchion Ärnbäck-Christie-Linde 1950
Perophoridae Giard 1872
Ecteinascidia Herdman 1880 [Perophoropsis Lahille 1890; Sluiteria]
Perophora Wiegmann 1835 [Tibiania; Porophora (sic) MilneEdwards 1843; Pterophora (sic) Desmarest 1858; Serophora (sic) Reichert 1875; Perephora (sic) Lahille 1890; Perophera (sic) Ritter 1907; Pherophora (sic) Seeliger 1907]
Ascidiidae Herdman 1882 [incl. Namiella Monniot & Monniot 1968]
Ascidia Linnaeus 1767 [Arcidia (sic) Meuschen 1778; Acidia (sic) Bosc 1816; Ascedia (sic) Bosc 1827; Ascidi (sic) McMurtrie 1834; Ascidea (sic) DeKay 1843; Afcidia (sic) Sars 1846; Ascida (sic) Pizon 1898; Ascidie Linnaeus 1767; Ascidiopsis Verrill 1872; Acidopsis (sic) Kingsley 1901; Bathyascidia Hartmeyer 1901; Phallusioides Huntsman 1912; Tunica; Herdmania Hartmeyer 1900 non Lahille 1888 non Thompson 1893; Herdmannia (sic) Schepotieff 1912]
Ascidiella Roule 1884 [Acidiella (sic) Pearcey 1902]
Fimbrora calsubia Monniot & Monniot 1991 [Fimbrosa Monniot & Monniot 1991]
Phallusia Savigny 1816 [Pachychlaena Hedman 1880; Phallusiopsis Hartmeyer 1908; Plurascidia Monniot & Monniot 2000; Phalusia (sic) Orsted 1844; Thallusia (sic) Hartmeyer 1908; Plallusia (sic) Smalian 1912]
Psammascidia teissieri Monniot 1962
