Achnanthidium
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: Achnanthidium affine Czarnecki, 1994Achnanthidium agardhii MereschkowskyAchnanthidium alpestre R. Lowe & J.P. KociolekAchnanthidium minutissimum Czarnecki