Heterostigma (tunicate)

Heterostigma is a genus of ascidian tunicates in the family Pyuridae.

Species within the genus Heterostigma include:
 * Heterostigma fagei Monniot C. & Monniot F., 1961
 * Heterostigma gonochorica Monniot F., 1965
 * Heterostigma mediterranea Pérès, 1958
 * Heterostigma melitensis Monniot F. & Monniot C., 1976
 * Heterostigma reptans Monniot C. & Monniot F., 1963
 * Heterostigma separ Ärnbäck, 1924

Species names currently considered to be synonyms:
 * Heterostigma gravellophila Peres, 1955 : synonym of Cratostigma gravellophila (Pérès, 1955)
 * Heterostigma singulare (Van Name, 1912) : synonym of Cratostigma singularis (Van Name, 1912)
 * Heterostigma singularis (Van Name, 1912) : synonym of Cratostigma singularis (Van Name, 1912)