Spaulding, S.,
Edlund, M.
(2008).
Fragilariforma.
In Diatoms of North America.
Retrieved October 09, 2024, from https://diatoms.org/genera/fragilariforma
Araphid
Fragilariforma
Central sternum very narrow, or absent
Cells joined by spines to form colonies
Striae uniseriate
Single rimoportula present at pole, in line with a stria
The valve margins of Fragilariforma are variable and may be linear, lanceolate, or elliptical with rostrate to capitate apices. In girdle view, frustules are rectangular in shape. Fragilariforma valves are characterized by a very narrow, or absent, central sternum. Striae are composed of distinct, uniseriate areolae. Frustules form...