Epithemia Sorex Guide Copy
Credit: Rex Lowe
  1. Valves strongly dorsiventrally arched
  2. Raphe canal arches almost to the dorsal margin
  3. Striae 12-15 in 10 μm
  4. Cells relatively small

Valves are strongly dorsiventrally arched. Striae are 12-15 in 10 μm and costae are 6-8 in 10 μm. There are 2-3 striae between costae. The central arch of the canal reaches almost to the dorsal margin.