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Guide to Semiorbis hemicyclus

(Ehrenb.) R.M.Patrick in Patrick and Reimer 1966

Semiorbis hemicyclus guide
  1. Valves arcuate, often irregularly
  2. Costae transapical

Valves are arcuate, often irregular in shape. Apices are inflated in smaller valves and subrostrate in larger valves. Transapical costae are distinct.

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