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Valves of C. solea are constricted in the middle. Valves of C. elliptica var. hibernica are larger, with fewer fibulae in 10 ┬Ám.

LM scalebar = 10 µm
Cymatopleura internationale LM1 Cymatopleura internationale LM2 Cymatopleura internationale LM3 Cymatopleura internationale LM4 Cymatopleura internationale LM5 Cymatopleura internationale LM6 Cymatopleura internationale LM7
Length Range
54-72 µm
Width Range
31-39 µm
Striae in 10 µm
8-18

Surirella librile

(Ehrenb.) Ehrenb. 1845

Cymatopleura solea LM1 Cymatopleura Solea 1A Sccwrp Cymatopleura solea LM3 Cymatopleura Solea 003Sccwrp Cymatopleura solea LM4 Cymatopleura solea LM2
Length Range
56-280 µm
Width Range
13-24 at the midsection, 15-36 at the broadest point µm
Striae in 10 µm
29-34

Also compare to

Cymatopleura elliptica var. hibernica

(W.Sm.) Van Heurck