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Guide to Psammothidium bioretii

(Germain) Bukht. and Round 1996

P Bioreti Guide Copy
Credit: Marina Potapova
  1. Valves elliptical
  2. Central area on both valves transversely elliptical or rectangular
  3. Axial areas and raphes oblique to the apical axis, not parallel between valves, sigmoid toward apices

Valves are elliptical. Both valves have narrow axial areas, which are often oblique to the apical axis, not parallel between the two valves, and sigmoid toward the apices. The central area is transversely elliptical or rectangular. The striae are radiate throughout .