Nupela Wellneri Guide
Credit: Marina Potapova
  1. Valves lanceolate with subcapitate to capitate ends
  2. Raphe present on both valves
  3. Striae not visible in LM

Valves are lanceolate with subcapitate to capitate apices. The raphe slits are slightly shorter and the distance between central raphe endings is greater on the convex than on the concave valve. Striae not visible in LM.