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Guide to Epithemia gibba

Ehrenb. (Kütz.) 1844

Rhopalodia Gibba Guide
Credit: Pat Kociolek
  1. Valves linear
  2. Valves large

Valves linear, with apices bent towards the ventral margin. The center is deflected slightly towards the dorsal margin and notched. The raphe is positioned in a canal. Costae are prominent, and extend across the valve face.