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Cymbopleura procera, a species described from the Columbia River in Oregon, has a wider axial area and a higher density of areolae in the striae (24-26 in 10 ┬Ám). Cymbopleura inaequalis, C. lata, and C. subrostrata have narrower axial areas and wider, more bluntly rounded apices. Proximal raphe ends are distinctly hooked in valves of C. subcuspidata and C. subrostrata.

LM scalebar = 10 µm
Cymbopleura Perprocera 0 Cymbopleura Perprocera 1 Cymbopleura Perprocera 2 Cymbopleura Perprocera 4 Cymbopleura Perprocera 5 Cymbopleura Perprocera 6 Cymbopleura Perprocera 7
Length Range
62.3-114.4 µm
Width Range
19.6-25.1 µm
Striae in 10 µm
8-9 at the valve center, 12-13 near the apices on the dorsal side

Cymbopleura inaequalis

(Ehrenb.) Krammer 2003

Cymbopleura inaequalis LM1 Cymbopleura inaequalis LM2 Cymbopleura inaequalis LM3 Cymbopleura inaequalis LM5 Cymbopleura inaequalis LM4 Cymbopleura inaequalis LM6 Cymbopleura inaequalis LM7
Length Range
86-190 µm
Width Range
30-40 µm
Striae in 10 µm
5-8 near the valve center, 8-12 near the apices

Cymbopleura lata

(Grunow) Krammer 2003

Cymbopleura lata LM1 Cymbopleura lata LM2 Cymbopleura lata LM3 Cymbopleura lata LM4 Cymbopleura lata LM5 Cymbopleura lata LM6 Cymbopleura lata LM7
Length Range
46-87 µm
Width Range
17.0-20.9 µm
Striae in 10 µm
8-10 at the valve center, 12-14 near the apices

Cymbopleura subrostrata

(Cleve) Krammer 2003

Cymbosubrostrata1 Cymbosubrostrata2 Cymbosubrostrata3 Cymbosubrostrata4 Cymbosubrostrata5 Cymbosubrostrata6 Cymbosubrostrata7
Length Range
153-255 µm
Width Range
39-50 µm
Striae in 10 µm
8-10 at the valve center, 13-16 at the apices

Cymbopleura subcuspidata

(Krammer) Krammer 2003

Cymbopleura subcuspidata LM1 Cymbopleura subcuspidata LM2 Cymbopleura subcuspidata LM3 Cymbopleura subcuspidata LM5 Cymbopleura subcuspidata LM6
Length Range
67-111 µm
Width Range
19-25 µm
Striae in 10 µm
9-12 (dorsal and ventral) at the valve center; 12-15 (dorsal) and 13-16 (ventral) at the apices

Also compare to

Cymbopleura procera

(Hust.) Krammer 2003