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Scenedesmus
''Scenedesmus'' is a genus of green algae, specifically of the Chlorophyceae. They are colonial and non-motile. == Taxonomy == Currently, there are 74 taxonomically accepted species of Scenedesmus.〔M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2015. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 16 April 2015.〕 Additionally, several subgenera have been identified, but vary according to the source. Hegewald denotes Acutodesmus, Desmodesmus, and Scenedesmus as the three major categories. Acutodesmus is characterized as having acute cell poles, while Desmodesmus and Scenedesmus have obtuse/truncated cell poles (differentiated by the presence or absence of spines respectively). Fossil records date Scenedesmus from 70 to 100 million years ago with Desmodesmus suspected to be the youngest of these three groups.〔Hegewald, Eberhard H. "Taxonomy and Phylogeny of Scenedesmus." The Korean Journal of Phycology 12.4 (1997): 235-46.〕
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