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Diagnostic features

Centric diatom (cells round in valve view, square to rectangular in girdle view). Often forms long filaments of cylindrical cells joined end to end, but may be found as single cells. Much narrower than filaments of Melosira. Often planktonic.

Typical habitats

Lakes, ponds and slow-flowing rivers.


Kingdom Chromista
Phylum Ochrophyta
Class Bacillariophyceae
Order Aulacoseirales
Family Aulacoseiraceae
Common name Diatoms