(Skvortzov) Nakov, Guillory, M.L.Julius, E.C.Ther. and A.J.Alverson 2015
Credit: Kalina Manoylov, David Burge
Valve face tangentially undulate
Depressed portion of valve ornamented
Striae reduced in length near the raised portion of valve
Valves are tangentially undulate with ornamentation on the depressed portion. Alveolate striae cover roughly the outer 1/3 of the valve face, and are reduced in length on the raised portion of the valve.