Compare

Caloneis bacillum is distinguished from C. hyalina by its smaller transverse fascia than in C. hyalina.

LM scalebar = 10 µm
Caloneis bacillum LM1 Caloneis bacillum LM5 Caloneis bacillum LM4 Caloneis bacillum LM2 Caloneis bacillum LM3
Length Range
8-20 µm
Width Range
3 µm
Striae in 10 µm
25-29

Also compare to

Caloneis hyalina

Hust. 1937