Spaulding, S.,
Edlund, M.
(2008).
Craticula.
In Diatoms of North America.
Retrieved May 01, 2026, from https://diatoms.org/genera/craticula?x-craft-preview=409442409a997390693ff24c7010fd6f1c96fb56f8f091fa016a63de9a54aaccecpiqubknd
Symmetric Biraphid
Craticula
Striae parallel, or nearly parallel
Valves lanceolate
Central area small or absent
Distinct internal valves may be present
The valves of Craticula are lanceolate. The striae are distinctly parallel, or nearly parallel. The central area is greatly reduced or absent. The genus is polymorphic, forming different valve morphologies. There are three valve types found for this taxon: vegetative, heribaudii, and craticula forms. The three forms are produced as a...