Gamaster

Gamaster is a genus of ascidian tunicates in the family Molgulidae.

Species within the genus Gamaster include:
 * Gamaster dakarensis Pizon, 1896
 * Gamaster guillei Monniot, 1994
 * Gamaster vallatum Monniot, 1978

Species names currently considered to be synonyms:
 * Gamaster japonicus Oka, 1934 : synonym of Eugyra japonicus (Oka, 1934)