Diploneis calcicolafrequens has narrower valves. Diploneis hinziae has more elliptical valves with bluntly rounded apices and biseriate striae in the marginal parts. Diploneis parahinziae has linear-elliptical valves with broadly rounded ends and higher striae- and areolae density (striae 12.5–14 and areolae 15–20 in 10 μm). Diploneis elliptica has a larger size range and expanded central area. Small valves of both species, however, are quite similar and differ only in stria density. Valves at the small end of the size range of these species should be carefully examined.

LM scalebar = 10 µm
Diploneis calcilacustris LM1 Diploneis calcilacustris LM3 Diploneis calcilacustris LM2 Diploneis calcilacustris LM4 Diploneis calcilacustris LM5 Diploneis calcilacustris LM6 Diploneis calcilacustris LM7
Length Range
20–32 µm
Width Range
11–15 µm
Striae in 10 µm

Diploneis calcicolafrequens

Lange-Bert. and Fuhrmann 2020

Diploneis calcicolafrequens LM1 Diploneis calcicolafrequens LM2 Diploneis calcicolafrequens LM3 Diploneis calcicolafrequens LM4 Diploneis calcicolafrequens LM5 Diploneis calcicolafrequens LM6 Diploneis calcicolafrequens LM8
Length Range
14.6-28.9 µm
Width Range
8.4-11 µm
Striae in 10 µm

Diploneis elliptica

(Kütz.) Cleve 1894

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

Also compare to

Diploneis hinziae

Lange-Bert. and Fuhrmann

Diploneis parahinziae

Lange-Bertalot, Fuhrmann and H. Ringel