The other Encyonopsis species with an isolated stigma all have either lanceolate or rhombic-lanceolate valves. Valves of Gomphonema hebridense and similar Gomphonema species are asymmetric with respect to the transapical axis.
LM scalebar = 10 µm
Length Range
41-59 µm
Width Range
4.9-7.6 µm
Striae in 10 µm
13-15 at the valve center, 15-18 at the ends on the dorsal side