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Cymbopleura elliptica has valves that are wider and more elliptic, with convex margins and often with capitate apices.

LM scalebar = 10 µm
Cymbopleura hybrida LM1 Cymbopleura hybrida LM2 Cymbopleura hybrida LM3 Cymbopleura hybrida LM4 Cymbopleura hybrida LM5 Cymbopleura hybrida LM6 Cymbopleura hybrida LM7
Length Range
29.7-48.3 µm
Width Range
6.9-8.1 µm
Striae in 10 µm
12-14

Cymbopleura elliptica

Krammer 2003

Cymbopleura elliptica LM1 Cymbopleura elliptica LM2 Cymbopleura elliptica LM3 Cymbopleura elliptica LM4 Cymbopleura elliptica LM5 Cymbopleura elliptica LM6 Cymbopleura elliptica LM7
Length Range
38-49 µm
Width Range
10.8-11.9 µm
Striae in 10 µm
10-13 at the valve center, 15-16 near the apices

Also compare to

Cymbopleura elliptica

Krammer 2003