Achnanthes is a genus of diatoms belonging to the family Achnanthaceae.
The genus was described in 1822 by Jean Baptiste Bory de Saint-Vincent.
The genus has cosmopolitan distribution.
Species: Achnanthes aapajaervensis Cleve-Euler Achnanthes abundans Manguin, 1954 Achnanthes acares Hohn & Hellerman Achnanthes acus Simonsen Achnanthes acuta Frenguelli
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