Stolonica diptycha

Distomus is a genus of ascidian tunicates in the family Styelidae.
Species within the genus Distomus include:

Distomus antiborealis Monniot, Monniot, Griffiths & Schleyer, 2001
Distomus fuscus Delle Chiaje, 1841
Distomus hupferi (Michaelsen, 1904)
Distomus malayensis Sluiter, 1919
Distomus pacificus Monniot & Monniot, 1991
Distomus rudentiformis (Sluiter, 1915)
Distomus variolosus Gaertner, 1774
Species names currently considered to be synonyms:

Distomus crystallinus (Renier, 1804): synonym of Polycitor crystallinus (Renier, 1804)
Distomus diptychos Hartmeyer, 1919: synonym of Stolonica diptycha (Hartmeyer, 1919)
Distomus elegans Quoy & Gaimard, 1834: synonym of Botryllus elegans (Quoy & Gaimard, 1834)
Distomus kukenthali (Gottschaldt, 1894): synonym of Eudistoma vitreum (Sars, 1851)
Distomus mamillaris Gaertner, 1774: synonym of Polycarpa mamillaris (Gaertner, 1774)
Distomus vitreum : synonym of Eudistoma vitreum (Sars, 1851)