Stenopterobia e Surirella (Bacillariophyceae, Surirellaceae) do Sistema Lago dos Tigres, Britânia, Goiás

Abstract

Lago dos Tigres System is composed of lotic habitats (Água Limpa and Vermelho rivers) and lentic habitats (Lago dos Tigres). It has great importance for tourism and agriculture in Britania, Goiás state. Considering the lack of studies on diatoms from central western Brazil, this work aimed to identify taxa of Stenopterobia Brébisson and Surirella Turpin, Surirellaceae family, occurring in the plankton of Lago dos Tigres System during the low water period. Sampling was done from June to November 2004 at 11 stations, using a 25-μm plankton net. Sixteen taxa were identified: two taxa were recorded for the genus Stenopterobia and 14 for the genus Surirella. Surirella splendida (Ehrenberg) Kützing was recorded at all stations. Stenopterobia delicatissima (Lewis) Brébisson and Stenopterobia pelagica Hustedt, Surirella biseriata var. constricta (Grunow) Hustedt, Surirella davidsonii Schmidt, Surirella didyma Kützing, Surirella linearis var. helvetica (Brun.) Meister, Surirella nervosa (A. Schmidt) Mayer, Surirella rorata Frenguelli and Surirella splendida (Ehrenberg) Kützing were registered for the first time in central western Brazil. A description, illustration and comments are given for each taxon.