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Diploneis finnica has a smaller central area and wider longitudinal canals than D. elliptica. Both D. finnica and D. subovalis are biseriate, while D. elliptica is uniseriate. Diploneis ovalis has a higher stria density (12-14 in 10 µm).

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 finnica

(Ehrenb.) Cleve 1891

Diploneis finnica LM1 Diploneis finnica LM2 Diploneis finnica LM3 Diploneis finnica LM4 Diploneis finnica LM5 Diploneis finnica LM6
Length Range
52-107 µm
Width Range
33-53 µm
Striae in 10 µm
7-9

Also compare to

Diploneis subovalis

Cleve 1894

Diploneis ovalis

(Hilse) Cleve 1891