||Stem group Camarodonta with:
- apical disc relatively large; monocyclic (one ocular insert in one taxon); plates rather firmly bound to the corona. Periproct large with smooth ovate outline;
- ambulacral plating glyphocyphid in style usually trigeminate, with lowest element the largest and all elements reaching the perradius. Sometimes with additional simple elements intercalated;
- primary tubercles perforate and crenulate; those of ambulacral and interambulacral zones similar in size;
- Peristome with small but distinct buccal notches.
||Lower Cretaceous - Eocene, Europe, Middle East, North Africa.
||Differing from Emiratiidae in having a smooth periproctal opening, not an angular opening, and its compound ambulacral plates have the lowest of the three elements the largest, as in echinid-style plate compounding. Temnopleuridae differ in having a hemicyclic or dicyclic apical disc and imperforate tubercles.