Navicula
Elongated diatoms.with many species varying from 5 to 200 um in length. creeping on mud etc in all types of water-body.Vorious related genera (Achnanthes etc) only distinguishable from Navicula by detailed examination. 78a cleaned frustule; 78b, living cell with a chloroplast on each side.Girdle view parallel-sided.
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