Spaulding, S.
(2011).
Gomphosphenia.
In Diatoms of North America.
Retrieved May 01, 2026, from https://diatoms.org/genera/gomphosphenia?x-craft-preview=cab8b13ef68d1e257235fd2491770f51dfe0c9a6c0ad3b95411776e5316d603alxhbyabypv
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....