Spaulding, S.
(2019).
Gomphonella.
In Diatoms of North America.
Retrieved May 01, 2026, from https://diatoms.org/genera/gomphonella?x-craft-preview=409442409a997390693ff24c7010fd6f1c96fb56f8f091fa016a63de9a54aaccecpiqubknd
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...