Cratostigma is a genus of ascidian tunicates in the family Pyuridae.
Species within the genus Cratostigma include:Sanamyan, K. (2015). Cratostigma Monniot & Monniot, 1961 . 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. Cratostigma campoyi Ramos, Turon & Lafargue, 1988 Cratostigma gravellophila (Pérès, 1955) Cratostigma intermedia Vazquez & Ramos-Espla, 1993 Cratostigma regularis Monniot C., 1963 Cratostigma simplex Millar, 1982 Cratostigma singularis (Van Name, 1912) Cratostigma vestigialis Turon, 1988
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