Spaulding, S.,
Edlund, M.
(2009).
Amphorotia.
In Diatoms of North America.
Retrieved November 22, 2024, from https://diatoms.org/genera/amphorotia
Eunotioid
Amphorotia
Valves slightly, to stongly, asymmetric to the apical axis
Valve symmetric to transapical axis
Rimoportulae two per valve
Sternum on valve face
Valves greater than 60 µm in length
Valves of Amphorotia are large in size, generally greater than 60 µm in length. The valves are asymmetric to the apical axis and symmetric to the transapical axis. In addition, the frustules are asymmetric to the transapical plane, so that the dorsal mantle is very broad as compared to the ventral mantle. Each valve has two rimoportulae,...