New reports of Surirella Turpin (Bacillariophyta, Surirellaceae) for Rio Grande do Sul State and BrazilThe study of Surirella genus in aquatic environments of the Coastal Plain revealed the presence of S. minuta Brébisson var. peduliformis Frenguelli, S. rumrichorum Metzeltin & Lange-Bertalot and Surirella chilensis Janisch var. tumida Hustedt. The geographic distribution of these species is restricted to South America. Descriptions, illustrations and comments on environmental conditions and geographic distribution of the species are presented.
diatoms; Surirella; taxonomy; geographic distribution
