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Guide to Simonsenia delognei

Lange-Bert. 1979

Simonsenia Delognei Guide
Credit: Carrie Graeff
  1. Valve apices extremely narrow, often protracted
  2. Costae 18 in 10 µm

The valves of S. delognei have extremely narrow apices that are often protracted. The costa density is 18 in 10 µm.