Spaulding, S.
(2019).
Gomphonella.
In Diatoms of North America.
Retrieved May 01, 2026, from https://diatoms.org/genera/gomphonella?x-craft-preview=cab8b13ef68d1e257235fd2491770f51dfe0c9a6c0ad3b95411776e5316d603alxhbyabypv
Asymmetric Biraphid
Gomphonella
Valves wedge-shaped
Apical porefield bisected by terminal raphe fissure
Pseudoseptae present at apices
Striae biseriate
Valves are wedge-shaped. Striae are biseriate (to triseriate) and composed of small, round areolae. The areolae are unoccluded. A diagnostic feature of the genus is an absence of a feature; valves lack stigmoids or stigmata. The raphe is filiform. Externally, the proximal raphe ends are slightly expanded. Internally, the proximal raphe...