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
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