Valves of G. apicatum are much larger than G. consector. Gomphonema parvulum has straight, parallel striae in comparison to the radiate, curved striae of G. consector. Gomphonema exilissimum has a gradually attenuated and acutely rounded headpole.

LM scalebar = 10 µm
Gomphonema Consector LM1 Gomphonema Consector LM2 Gomphonema Consector LM3 Gomphonema Consector LM Gomphonema Consector LM5 Gomphonema Consector LM6 Gomphonema Consector LM7
Length Range
16.2-24.5 µm
Width Range
5.3-6.0 µm
Striae in 10 µm

Gomphonema apicatum

Ehrenb. 1854

Gomphonema apicatum LM1 Gomphonema apicatum LM2 Gomphonema apicatum LM5 Gomphonema apicatum LM4 Gomphonema apicatum LM3
Length Range
40-53 µm
Width Range
13-15 (as measured at the broadest portion of the valve) µm
Striae in 10 µm

Also compare to

Gomphonema parvulum

Kutz. 1849

Gomphonema exilissimum

(Grunow) Lange-Bert. and Reichardt 1996