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Guide to Planothidium reichardtii

Lange-Bertalot and Werum 2004

Planothidium Dubium Guide
Credit: Marina Potapova
  1. Valves with subcapitate to capitate apices
  2. Valves 4.0-8.5 μm wide
  3. Rapheless valve with a shallow depression
  4. Axial area on rapheless valve narrow linear

Valves with narrowly subcapitate to capitate apices. The raphe valve has a linear axial area and transversely rectangular central area. The rapheless valve has a narrow, linear axial area. The asymmetric central area on the rapheless valve contains a shallow depression.