Kleindl, P.
(2022).
Tetramphora.
In Diatoms of North America.
Retrieved October 10, 2024, from https://diatoms.org/genera/tetramphora
Asymmetric Biraphid
Tetramphora
Valve faces in single plane
Striae composed of apically or transapically oriented areolae
Dorsal central area hyaline
Cells are elliptic. Frustules are strongly asymmetric, so that both valve faces lie in the same plane. Valves are moderately to strongly dorsiventral.
The raphe is biarcuate. The proximal raphe ends are ventrally deflected, but they may be obscured by a hyaline area. The hyaline area may give the appearance of dilated to undulate...