Fragilaria crotonensis is a common species in temperate, mesotrophic lakes of North America. Cells can be joined in large ribbon-like colonies. These colonies are resistant to sinking in the water column and help F. crotonensis maintain position in the phytoplankton.

Where is the rimoportula of Fragilaria crotonensis?

The rimoportula is located along a stria, close to the axial area. Copulae, or girdle bands, were not observed. Fragilaria crotonensis is a common species in temperate, mesotrophic lakes of North America. Cells can be joined in large ribbon-like colonies.

Is Fragilaria a diatom?

Fragilaria is a genus of freshwater and saltwater diatoms. It is usually a colonial diatom, forming filaments of cells mechanically joined by protrusions on the face and in the center of their valves. The individual diatoms appear swollen in their centers where they are joined to the colonial ribbon.

What is the taxonomy of the Fragilaria?

The taxonomy of the genus is still uncertain. The Fragilaria have a pseudoraphe, rather than a true longitudinal groove in their valves. The valves are symmetrical with transverse striae. ^ Kociolek, edited by Joseph Seckbach, Patrick (2011).