Diatoms of North AmericaDiatoms of North America
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Compare Diploneis elliptica

(Kütz.) Cleve 1894

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Diploneis ovalis has larger central area and a higher stria density (12-14 in 10 µm). 

Diploneis krammeri also has higher stria density (11-12 in 10 µm). 

Diploneis dilatata has biseriate striae.

Diploneis austriaca has conopeum, visible only under SEM.

LM scalebar = 10 µm
Diploneis elliptica LM1 Dielliptica 1 Dielliptica 2 Dielliptica 3 Dielliptica 4 Dielliptica 5
Length Range
30-65 µm
Width Range
17-36 µm
Striae in 10 µm
9-10

Diploneis ovalis

(Hilse) Cleve 1891

Diploneis Ovalis 1 Diploneis Ovalis 2 Diploneis Ovalis 3 Diploneis Ovalis 4 Diploneis Ovalis 5 Diploneis Ovalis 6 Diploneis Ovalis 7
Length Range
32.5-58.7 µm
Width Range
20.7-32.6 µm
Striae in 10 µm
12-14

Diploneis krammeri

Lange-Bert. and E.Reichardt in Rumrich et al. 2000

Diploneis krammeri LM4 Diploneis krammeri LM5 Diploneis krammeri LM6
Length Range
31-49 µm
Width Range
15-16 µm
Striae in 10 µm
11-12

Diploneis dilatata

(M.Peragallo) Lange-Bert. and Fuhrmann 2016

Diploneis dilatata LM7 Diploneis dilatata LM6 Diploneis dilatata LM5 Diploneis dilatata LM4 Diploneis dilatata LM3 Diploneis dilatata LM2 Diploneis dilatata LM1
Length Range
34-84 µm
Width Range
25-50 µm
Striae in 10 µm
8-10

Also compare to

Diploneis austriaca

Lange-Bertalot and Fuhrmann