(Lange-Bert. in Lange-Bert. and Krammer) Lange-Bert. in Rumrich, Lange-Bert. and Rumrich 2000
Credit: Marina Potapova
Valves lanceolate with subcapitate to capitate ends
Raphe present on both valves
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.