The Echinoid Directory

 Camarodonta with:

• apical disc relatively small and dicyclic. Periproct subcircular with smooth edges (periproctal plates not indenting apical ring);
• ambulacra trigeminate, with echinid style compounding. Pore-pairs forming a simple adradial band which does not expand adorally.
• primary tubercles in ambulacral and interambulacral zones similar in size;
• primary tubercles imperforate and with or without crenulation;
• deep and sharp-edged pits at triple suture points at least in juveniles and usually throughout life; often large and prominent;
• peristome much larger than apical disc; buccal notches obsolete.

Upper Eocene to Recent, worldwide.

The sharply defined sutural pits distinguish these echinoids from all other regular echinoids.

Mortensen, T. (1943) A monograph of the Echinoidea Part III.2, Camarodonta 1. C. A. Reitzel, Copenhagen.