red sea-squirt

Halocynthia is a genus of ascidian tunicates in the family Pyuridae. Species such as H. roretzi are eaten in parts of Asia as a delicacy.
Species within the genus Halocynthia include:

Halocynthia aurantium (Pallas, 1787)
Halocynthia breviramosa Sluiter, 1904
Halocynthia cactus (Oka, 1932)
Halocynthia dumosa (Stimpson, 1855)
Halocynthia hilgendorfi (Traustedt, 1885)
Halocynthia igaboja Oka, 1906
Halocynthia igaguri Tokioka, 1953
Halocynthia microspinosa (Van Name, 1921)
Halocynthia okai Ritter, 1907
Halocynthia papillosa (Linnaeus, 1767)
Halocynthia pyriformis (Rathke, 1806)
Halocynthia roretzi (Drasche, 1884)
Halocynthia simaensis Tokioka, 1949
Halocynthia spinosa Sluiter, 1905
Halocynthia turboga (Oka, 1929)
Species names currently considered to be synonyms:

Halocynthia arabica Monniot, 1965: synonym of Halocynthia spinosa Sluiter, 1905
Halocynthia arctica (Hartmeyer, 1899): synonym of Boltenia echinata (Linnaeus, 1767)
Halocynthia carnleyensis Bovien, 1921: synonym of Pyura trita (Sluiter, 1900)
Halocynthia castaneiformis (Drasche, 1884): synonym of Boltenia villosa (Stimpson, 1864)
Halocynthia cerebriformis (Herdman, 1881): synonym of Pyura spinosa (Quoy & Gaimard, 1834)
Halocynthia...