Ferrario, M.E. & Sar, E.A. (1990). Ultraestructura de Pleurosigma chilensis var. patagonica nov. var. (Bacillariophyceae). Darwiniana, 30(1-4): 201-204

269295

Ferrario, M.E. & Sar, E.A.

1990

30(1-4): 201-204

Publication

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ABSTRACT: Ultrastructure o/Pleurosigma chilensis var. patagónica nov. var. (Bacillariophyceae). The genus Pleurosigma has a few planktonic species, with straight or almost straight outline and rap he. In this work we study a material with these characteristics from Caleta Valdés (Chubut, Argenti na), that we consider a new variety of Pleurosigma chilensis Hustedt et Krasske. Pleurosigma chilensis var. patagónica nov. var. differs from P. chilensis by its bigger size, with a wider range as regards the number of striae, a bigger and very conspicuous circular central area and bigger helictoglossae. Comparissons with the nearest species are established: P. simplex Ricard and P. intermedium Smith. The samples were cleaned with the conventional methods and analized with optical and electronic scanning microscopy.

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