The Echinoid Directory

Family Echinocyamidae Lambert & Thiery, 1914, p. 287


 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.