Compare

Cymbella janischii can be distinguished from C. mexicana by its larger size, narrower spacing between striae, long pointed areolae forming the central area and distinct apical pore fields.

LM scalebar = 10 µm
Cymbella janischii LM3 Cymbella janischii LM2 Cymbella janischii LM1
Length Range
130-360 µm
Width Range
35-68 µm
Striae in 10 µm
6-8

Cymbella mexicana

(Ehrenb.) Cleve 1894

Cymbella mexicana LM4 Cymbella mexicana LM1 Cymbella mexicana LM6 Cymbella mexicana LM3 Cymbella mexicana LM5 Cymbella mexicana LM7 Cymbella mexicana LM2
Length Range
80-155 µm
Width Range
26-33 µm
Striae in 10 µm
6-8 in the central valve, 7-10 at the ends