achnanthes achnanthes achnanthes is a genus of diatoms belonging to the family achnanthaceae. achnanthes album général des cryptogames, pl. 326. scientific classification domain: eukaryota clade: diaphoretickes clade: sar clade: stramenopiles phylum: gyrista subphylum: ochrophytina class: bacillariophyceae order: mastogloiales family: achnanthaceae genus: achnanthesde saint-vincent, 1822 extant species see text achnanthes lanceolata 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