- apical disc relatively small; monocyclic. Periproct subcircular with smooth edges (periproctal plates not indenting apical ring);
- ambulacra with echinid style compounding;
- primary tubercles in ambulacral and interambulacral zones similar; imperforate and obviously crenulate;
- peristome much larger than apical disc; no phyllodes and shallow buccal notches;
- Lantern unknown.