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Guide to Tryblionella gracilis

W.Sm. 1853

Tryblionella Gracilis Guide
Credit: Jacob Lister
  1. Valve fusiform
  2. Apices cuneate
  3. Longitudinal undulation distinct
  4. Costae and fibulae faint

Valves large and fusiorm.The longitudinal undulation is distinct. Both transapical costae and fibulae are relatively faint. Striae are difficult to observe with LM.