Cratostigma

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

Species within the genus Cratostigma include:
 * 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