This taxon is quite distinctive for its large size and expanded, asymmetric central area.

LM scalebar = 10 µm
Length Range
74.2-113.2 µm
Width Range
10-14 µm
Striae in 10 µm
9-12
Gomphonema semiapertum LM1
Gomphonema semiapertum LM2
Gomphonema semiapertum LM3
Gomphonema semiapertum LM4
Gomphonema semiapertum LM5
Gomphonema semiapertum LM6
Gomphonema semiapertum LM7
Gomphonema semiapertum LM1 Gomphonema semiapertum LM2 Gomphonema semiapertum LM3 Gomphonema semiapertum LM4 Gomphonema semiapertum LM5 Gomphonema semiapertum LM6 Gomphonema semiapertum LM7

Gomphonema californicum

Stancheva and Kociolek 2016

Length Range
22-69 µm
Width Range
5.6-8.3 µm
Striae in 10 µm
10-15
Gomphonema californicum LM3 Gomphonema californicum LM1 Gomphonema californicum LM2 Gomphonema californicum LM4 Gomphonema californicum LM5 Gomphonema californicum LM6