Spaulding, S.
(2011).
Gomphosphenia.
In Diatoms of North America.
Retrieved May 01, 2026, from https://diatoms.org/genera/gomphosphenia?x-craft-preview=409442409a997390693ff24c7010fd6f1c96fb56f8f091fa016a63de9a54aaccecpiqubknd
Asymmetric Biraphid
Gomphosphenia
Valves cuneate
Axial area broad
Raphe straight
Internal proximal raphe ends anchor-shaped
Valves are cuneate, and may have linear or undulate margins. Valves are never bent or flexed. The raphe is straight and filiform. Externally, both proximal and distal raphe ends are straight. Internally, the proximal raphe ends terminate in branched, anchor shaped fissures. Internally, the distal raphe terminates in a helictoglossa....