Gomphonema caperatum and G. insularum are less clavate. Gomphonema freesei is larger, both in length and breadth. Gomphonema amerhombicum is less clavate and larger in length and breadth. Gomphonema christenseni is larger and is astigmate.
LM scalebar = 10 µm
Length Range
17.8-29.5 µm
Width Range
5.0-5.8 µm
Striae in 10 µm
13-16 at mid-valve; up to 18 at the apices