The Echinoid Directory

Family Echinocyamidae Lambert & Thiery, 1914, p. 287

Diagnosis

Laganiformes with:

simple radial internal buttresses along interambulacral margins;
periproct close to peristome and opening bounded by first and second paired post-basicoronal interambulacral plates;
interambulacral zones terminating adapically in one or two single small plates;
basicoronal circlet small and unspecialized;
no food grooves.

Range

Eocene to Recent; worldwide.