Cylindrospermopsis is a planktonic genus of filamentous cyanobacteria known for its blooms in eutrophic waters. The type species is the tropical Cylindrospermopsis raciborskii (Woloszynska) Seenayya & Subbaraju. The cyanotoxin cylindrospermopsin was first identified from a species of this genus. Guiry, M.D.; Guiry, G.M. (2008). 'Cylindrospermopsis'. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway.