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Guide to Platessa strelnikovae

Enache, Potapova and E.Morales 2014

Platessa Strelnikovae Guide
Credit: Marina Potapova
  1. Valves broadly elliptic
  2. Raphe valve with rhomboid central area
  3. Rapheless valve with rhomboid axial area
  4. Rapheless valve with horseshoe depression

Valves are broadly elliptic with rounded, sometimes slightly protracted apices. Raphe valve has narrow, straight axial area, widening towards rhomboid central area. Raphe does not have terminal fissures. Axial area on rapheless valve is broad, rhomboid, with one-sided horseshoe depression extended to the valve margin.