Middle Cambrian
Jince Formation
Paradoxides gracilis Zone, Jince, Czech Republic

Rare 33mm x 60mm early Echinoderm on 94mm slab.

Edrioasteroid. Echinoderm.

Stromatocystites is one of the earliest-known genera of the Class Edrioasterioidea, one of the most ancient echinoderm groups.  This genus is known from various Middle Cambrian sites in Europe.

Edrioasteroids survived into the Permian but died out before the end of the period.