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Genus Staurodesmus

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The genus Staurodesmus was erected by Teiling in 1948 but he omitted to designate a type species of this genus. This omission was corrected by Compère in 1977. His choice of Staurodesmus triangularis Teiling as type species was, among other things, dictated by the consideration that in this species all of 2-, 3- and 4-radiate forms occur as well as Janus forms, thus illustrating Teiling's motives for the erection of the genus Staurodesmus. The most relevant morphological characteristic in species identification is the shape of the semicell body and, in connection with that, the shape of the sinus. Projection and length of the spines in some of the species are relatively consistent, in other species, on the contrary, they may be quite variable. The same holds for the degree of radiation: in some species it is consistent, in others it is variable.

Keywords: Compère; genus Staurodesmus ; semicells; spines; Teiling



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