Compare

Cymbella janischii valves are larger in length and breadth. The proximal raphe ends are larger and the terminal fissures are dorsally deflected ~60º (C. mexicana are dorsally deflected at nearly 90º).

LM scalebar = 10 µm
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

Cymbella janischii

(A.Schmidt) De Toni 1891

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