Compare

Valves of Epithemia musculus are more arched and wider. The apices of Rhopalodia gibberula var. vanheurckii are more bent toward the ventral side.

LM scalebar = 10 µm
Rhopalodia gibberula LM13 Rhopalodia gibberula LM12 Rhopalodia gibberula LM11 Rhopalodia gibberula LM8 Rhopalodia gibberula LM10 Rhopalodia gibberula LM9
Length Range
26.5-42.5 µm
Width Range
5-9.5 µm
Striae in 10 µm
12-23 (ventral)

Epithemia musculus

Kütz. 1844

Rhopalodia musculus LM1 Rhopalodia musculus LM4 Rhopalodia musculus LM5 Rhopalodia musculus LM3 Rhopalodia musculus LM2
Length Range
12-60 µm
Width Range
10-16 µm
Striae in 10 µm
14-18

Also compare to

Rhopalodia gibberula var. vanheurckii

O.Müll. 1900