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Guide to Psammothidium lacustre

Enache and Potapova 2013

Psammothidium Lacustre Guide
Credit: Marina Potapova
  1. Valves large, lanceolate
  2. Raphe with long terminal fissures, curved to opposite sides
  3. Raphe valve with rectangular central area
  4. Rapheless valve with round central area

Valves are lanceolate. The long terminal raphe fissures are turned in opposite directions. The raphe valve has a linear axial area and a rectangular central area. The rapheless valve has narrow axial area and a round central area. The striae are radiate on both valves.