Spaulding, S.,
Edlund, M.
(2008).
Fragilaria.
In Diatoms of North America.
Retrieved February 19, 2025, from https://diatoms.org/genera/fragilaria
Araphid
Fragilaria
Frustules rectangular to lanceolate, in girdle view
Frustules joined by spines to form colonies
Single rimoportula present
Girdle bands open
Fragilaria frustules are rectangular to lanceolate in girdle view. The pattern of ornamentation on the valve face is variable, but a central sternum is generally present. Frustules are joined by small marginal spines to form ribbon like (band-shaped) colonies. A single rimoportula is present, usually positioned at a distal end. Small,...