Achnanthidium is a genus of diatoms belonging to the family Achnanthidiaceae.
The genus was described in 1844 by Friedrich Traugott Kützing.
The genus has cosmopolitan distribution.
Species: (see a more complete list)List of species in genus Achnanthidium from Phycology Section of the Academy of Natural Sciences of Drexel University, last access 8/24/2022 Achnanthidium affine (Grunow) Czarnecki, 1994 Achnanthidium agardhii (Kützing) Mereschkowsky Achnanthidium alpestre (R. Lowe & J.P. Kociolek) R. Lowe & J.P. Kociolek Achnanthidium minutissimum (Kützing) Czarnecki Achnanthidium minutissimum (Kützing) Czarnecki from Phycology Section of the Academy of Natural Sciences of Drexel University, last access 8/24/2022
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