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Studies on the Genera Gyrosigma and Pleurosigma (Bacillariophyceae): Pleurosigma species in the plankton from the Pacific coast of Mexico, with the description of P. gracilitatis sp.nov.

Frithjof A.S. STERRENBURG, María Esther MEAVE DEL CASTILLO & Mary Ann TIFFANY

en Cryptogamie, Algologie 24 (4) - Pages 291-306

Published on 28 November 2003

Plankton samples from the Pacific coast of Mexico included some Pleurosigma species, of which three are particularly interesting: Pleurosigma ibericum Peragallo (typified here), P. distinguendum Hustedt, and a species fully matching all available data for Pleurosigma elongatum var. gracile Grunow. The latter diatom, here described as Pleurosigma gracilitatis sp. nov., cannot taxonomically be placed as a variety of P. elongatum W. Smith, as verified by a study of the type of the latter species. Its specimens were seen in various stages of valve morphogenesis. Type slide numbers are designated for Pleurosigma normanii Ralfs in Pritchard and P. rhombeum (Grunow in Cleve et Grunow) H. Peragallo.


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