Helicoplacus gilberti
Early Cambrian
Poleta Formation
White Mountains, Inyo County, CA, USA
Large 22mm on 108mm slab (r6).

Helicoplacus is a genus of early echinoderms of the Class Helicoplacoidea. Isolated plates of helicoplacoids have been found at a few different sites around the world but the group is known from complete specimens at this locality.

It seems helicoplacoids lived only during the Early Cambrian.

See: Helicoplacoidea (opens in a new window)