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Guide to Craticula ambigua

D.G.Mann in Round, R.M.Crawford and D.G.Mann 1990

Craticula Ambigua Guide
Credit: Gina LaLiberte
  1. Valves large
  2. Ends rostrate to subcapitate
  3. Axial area narrow

Valves are large and lanceolate, with rostrate ends. Striae are slightly radiate, becoming convergent near the ends. The axial area is narrow and slightly expanded in the central area.