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Research Letters in Ecology
Volume 2008, Article ID 140245, 5 pages
Research Letter

The Diatom Anorthoneis dulcis Hein from Southern Brazil: Morphology and Ecology

Departamento de Botânica, Universidade Federal de Pelotas, Pelotas, RS CEP 96010-900, Brazil

Received 24 July 2007; Accepted 18 October 2007

Academic Editor: Patricia Mosto

Copyright © 2008 Garcia Marinês and Talgatti Dávia Marciana. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A new geographic locality for Anorthoneis dulcis is reported. The paper describes the distribution and relative abundance of A. dulcis in Lagoa dos Patos lagoon (a lagoon in Rio Grande do Sul state, Brazil) from samples collected between 2004 and 2005, and shows that this rare species is present all year round. This study extends the species distribution to South America indicating that the species can thrive on sand grains in lentic estuarine, and freshwater areas. It widens the range of tolerance to environmental parameters. The valve fine structure, morphology, and dimensions are in agreement with the original diagnosis.