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Guide to Psammothidium obliquum

(W.Greg.) M.Potapova 2018

Psammothidium obliquum guide
  1. Valves broadly lanceolate
  2. Apices obtuse to slightly protracted
  3. Raphe oblique to apical axis
  4. Fascia asymmetric, wedge-shaped
  5. Striae radiate, punctate

Valves are broadly lanceolate, with obtuse to slightly protracted apices. The raphe is oblique to the apical plane of the valve. The central area is an asymmetric, wedge-shaped fascia on both valves. The striae are radiate and punctate.