Compare Gomphosinica geitleri
Compare
Both Gomphosinica geitleri and Gomphoneis olivaceum possess distinct helictoglossae and a somewhat similar central area, but G. olivaceum lacks a stigma. Gomphosinica glaceriana is very similar in valve size and outline. The valves of G. robusta have a lower length to width ratio. Gomphosinica subtilis is more narrow, 3.5-4.0 µm. Gomphosinica capitata has a distinctly capitate headpole.
LM scalebar = 10 µm
Length Range
12-38 µm
12-38 µm
Width Range
4.5-6.6 µm
4.5-6.6 µm
Striae in 10 µm
16-20 near the center valve, 18-20 near the headpole, 16-20 near the footpole
16-20 near the center valve, 18-20 near the headpole, 16-20 near the footpole
Gomphonella olivacea
Length Range
14-40 µm
14-40 µm
Width Range
5-8 µm
5-8 µm
Striae in 10 µm
10-13 in the center of the valve, 12-14 at the ends
10-13 in the center of the valve, 12-14 at the ends