Cymbopleura tynnii is much larger. Cymbopleura stauroneiformis has rhombic-lanceolate valves and narrower apices. Cymbopleura mongolica has wider valves and capitate apices.

LM scalebar = 10 µm
Cymbopleura Laszlorum Mdc 689501 1 Cymbopleura Laszlorum Mdc 689501 2 Cymbopleura Laszlorum Mdc 689301 3 Cymbopleura Laszlorum Mdc 689301 4 Cymbopleura Laszlorum Mdc 689301 5
Length Range
41-54 µm
Width Range
9.7-11.4 µm
Striae in 10 µm
14 at the valve center up to 22 at the apices

Cymbopleura tynnii

(Krammer) Krammer 2003

Cymbopleura tynnii LM1 Cymbopleura tynnii LM2 Cymbopleura tynnii LM3 Cymbopleura tynnii LM4 Cymbopleura tynnii LM5
Length Range
59.6-82.3 µm
Width Range
15.7-18.6 µm
Striae in 10 µm
10-13 near the valve center, up to 18 near the ends

Also compare to

Cymbopleura stauroneiformis

(Lagerst.) Krammer

Cymbopleura mongolica

Metzeltin, Lange-Bert. and Nergui