Heterostigma is a genus of ascidian tunicates in the family Pyuridae.
Species within the genus Heterostigma include:Sanamyan, K. (2015). Heterostigma Ärnbäck-Christie-Linde, 1924 . In: Shenkar, N.; Gittenberger, A.; Lambert, G.; Rius, M.; Moreira Da Rocha, R.; Swalla, B.J.; Turon, X. (2015) Ascidiacea World Database. Accessed through: World Register of Marine Species on 2015-12-29. 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)
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