Gymnaster

"GYMNASTER" Schütt, 1891, p.19.  Siliceous dinoflagellate genus.  Taxonomic senior synonym: Actiniscus, according to Fensome et al. (1993b, p.50–51).  Type: not designated.

Species List:

"Gymnaster cinctus"
"Gymnaster pentasterias"
"Gymnaster sirius"
Gymnaster tetrasterias