Diatoms of North AmericaDiatoms of North America
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Guide to Amphora copulata

(Kütz.) Schoeman and R.E.M.Archibald 1986

Amphora Copulata Guide
  1. Dorsal fascia distinct
  2. Ventral striae uninterrupted
  3. Raphe arched
  4. Proximal raphe ends dorsally deflected
  5. Dorsal striae interrupted by intercostal ribs

A dorsal and ventral fascia are present. The dorsal fascia is typically ‘closed’ by a row of short axial striae and the ventral fascia extends to the valve margin. Dorsal striae are interrupted by intercostal ribs, while ventral striae are composed of a single row of areolae.