Coscinodiscus is a genus of centric diatoms in the family Coscinodiscaceae. It is the type genus of its family. There are over 200 species of Coscinodiscus.M.D. Guiry in Guiry, M.D. & Guiry, G.M. 19 October 2015. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org/browse/taxonomy/#77954 Coscinodiscus argus Ehrenberg 1839 is the type species of this genus.