Spaulding, S.
(2019).
Gomphonella.
In Diatoms of North America.
Retrieved December 12, 2025, from https://diatoms.org/genera/gomphonella
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...
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