Gymnaster sirius

"sirius" (Ehrenberg, 1841, p.150) Schütt, 1891, p.20.  Holotype: not designated NOW Actiniscus.  Originally Dictyocha subgenus Actiniscus, subsequently (and now) Actiniscus, thirdly Distephanus (name not validly published; Appendix A), fourthly Gymnaster.  Dumitrică (1973, p.822) considered Dictyocha (now Actiniscus) pentasterius to be the questionable taxonomic senior synonym of this species.  N.I.A.  Age: Miocene.

Parent: Gymnaster