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Delicata canadensis has lunate valves with a tumid ventral margin and reverse-lateral proximal raphe ends. Cymbopleura incerta and other small Cymbopleura species have wider valves (>5 ┬Ám wide), lower stria density and differing valve shapes.

LM scalebar = 10 µm
Cymbopleura Tundraphila LM1 Cymbopleura Tundraphila LM2 Cymbopleura Tundraphila LM3 Cymbopleura Tundraphila LM4 Cymbopleura Tundraphila LM5
Length Range
20-32 µm
Width Range
4.2-4.9 µm
Striae in 10 µm
17-21 at valve center, up to 28 at the apices

Delicata canadensis

L.L. Bahls 2017

Delicata canadensis LM1 Delicata canadensis LM2 Delicata canadensis LM4 Delicata canadensis LM3 Delicata canadensis LM5 Delicata canadensis LM6
Length Range
23-36 µm
Width Range
4.1-5.4 µm
Striae in 10 µm
18-22 dorsal, 20-25 ventral

Cymbopleura incerta

(Grunow) Krammer 2003

Cymboincerta2 Cymboincerta3 Cymboincerta5 Cymboincerta6 Cymboincerta7
Length Range
31-58 µm
Width Range
7.3-10.2 µm
Striae in 10 µm
15-16 at the valve center, 18-20 near the apices