Discostella asterocostata guide2
  1. Valves strongly concentrically undulate
  2. Marginal fultoportulae every 2-4 striae
  3. Marginal striae with distinct shadow line
  4. Marginal fultopuortulae with spine-like extensions

Valves are strongly concentrically undulate. Valve margin marked by distinct fultoportulae, with long, spine like extensions. The marginal fultoportulae have a spacing of 1 every 2-4 striae. Marginal striae have a distinct shadow line, which represent internal chambers.