Diatoms of North AmericaDiatoms of North America
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Compare Planothidium reichardtii

Lange-Bertalot and Werum 2004

Compare

Planothidium dubium has less capitate and more narrow apices. Planothidium potapovae, P. rostratum and other species in the P. rostratum species complex are similar in size and shape, however, these taxa all possess a cavum on the rapheless valve.

LM scalebar = 10 µm
Planothidium dubium LM7 Planothidium dubium LM8 Planothidium dubium LM6 Planothidium dubium LM2 Planothidium dubium LM1 Planothidium dubium LM3 Planothidium dubium LM4
Length Range
7-20 µm
Width Range
4-8.5 µm
Striae in 10 µm
13-15

Planothidium potapovae

C.E.Wetzel and Ector 2019

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
11-13

Also compare to

Planothidium dubium

(Grun.) Round and Bukht.