Micrasterine spatangoids with:
- apical disc ethmolytic with four gonopores;
- petals sunken, relatively short;
- anterior ambulacrum sunken, with differentiated pore-pairs associated with funnel-building tube-feet;
- labral plate short and mushroom-shaped;
- episternal plates trapezoidal, tapered to posterior and indented by ambulacral plate 6;
- peripetalous and bilobed subanal fascioles present
- aboral tubercles fine, uniform and dense; no primary tubercles.