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Guide to Planothidium holstii

(Cleve) Lange-Bert. 1999

Planothidium Holstii Guide
Credit: Megan Otu, Marina Potapova and Mihaela Enache
  1. Valves relatively large
  2. Apices slightly rostrate
  3. Central area "bow tie" to oval on raphe valve
  4. Central area large, broad on rapheless valve

Valves are relatively large with slightly rostrate apices. The raphe valve has a distinct central area that is "bow tie" shaped. The rapheless valve has a large, broad central area, becoming more narrow toward the apices. Distal raphe ends are deflected to opposite sides of the valve.