Diatoms of North AmericaDiatoms of North America
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Compare Planothidium rostratoholarcticum

Lange-Bert. and Bak 2014

Compare

Planothidium rostratum has elliptic valves, with rostrate apices and a higher stria density (Cantonati et al. 2017). Planothidium potapovae, P gallicum and other species in the "P. rostratum" species complex have rostrate apices. Planothidium reichardtii is similar in valve size and outline, but lacks a cavum.

LM scalebar = 10 µm
Planothidium rostratoholarcticum LM1 Planothidium rostratoholarcticum LM2 Planothidium rostratoholarcticum LM3 Planothidium rostratoholarcticum LM4 Planothidium rostratoholarcticum LM5 Planothidium rostratoholarcticum LM7 Planothidium rostratoholarcticum LM5
Length Range
8.5-12.5 µm
Width Range
4.9-5.5 µm
Striae in 10 µm
13.5-14.5

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

Planothidium reichardtii

Lange-Bertalot and Werum 2004

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

Also compare to

Planothidium gallicum

C.E.Wetzel and Ector

Planothidium rostratum

(Østrup) Lange–Bert.