Echinoderm genera

Genocidaris is a genus of echinoderms native worldwide.

Acaudina is a genus of sea cucumbers of the family Caudinidae. They are small, smooth and spindle-shaped, with a thin body wall and are distinguished by their absence of a caudal appendage.

thumb | right Euretaster is a genus of echinoderms belonging to the family Pterasteridae.

Ophiopteris is a genus of brittle stars. The genus was first described in 1877 from a specimen collected in New Zealand.