Planothidium potapovae differs from Planothidium rostratum, by the lanceolate-elliptical valves with rostrate or narrowly subcapitate apices and wider central areas.

LM scalebar = 10 µm
Gsn23403  Plrostr 3 Gsn23403  Plrostr 2 Gsn23403  Plrostr 5 Gc48893A 1A
Length Range
11.0-17.5 µm
Width Range
5.0-6.0 µm
Striae in 10 µm

Also compare to

Planothidium rostratum