Spaulding, S.,
Edlund, M.
(2008).
Craticula.
In Diatoms of North America.
Retrieved November 10, 2024, from https://diatoms.org/genera/craticula
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...