Compare Epithemia smithii
Epithemia sorex has smaller valves (less than 9 µm wide), 6 to 8 costae in 10 µm, and usually 2 (sometimes 3) striae between costae. Valves of E. cistula do not have recurved apices and the branches of the raphe canal follow a straighter line to the apices closer to the dorsal margin.
LM scalebar = 10 µm
Length Range
30.3-85.1 µm
30.3-85.1 µm
Width Range
9.4-13.3 µm
9.4-13.3 µm
Striae in 10 µm
13-15
13-15
Length Range
20-33 µm
20-33 µm
Width Range
7.3-9 µm
7.3-9 µm
Striae in 10 µm
12-15
12-15
