Fottea 12(2): 171-188, 2012 | DOI: 10.5507/fot.2012.013

Ultrastructure of Aulacoseira brasiliensis sp. nov. (Coscinodiscophyceae) and comparison with related species.

Priscila Izabel Tremarin1, Thelma Alvim Veiga Ludwig2, Lezilda Carvalho Torgan3
1 Programa de Pós-graduação. Universidade Federal do Rio Grande do Sul, Departamento de Botânica, 9500, Av. Bento Gonçalves, prédio 43433, 91501-970, Porto Alegre, Rio Grande do Sul, Brasil
2 Universidade Federal do Paraná, Departamento de Botânica, Caixa Postal 19031, 81531-990, Curitiba, Paraná, Brasil
3 Museu de Ciências Naturais - Fundação Zoobotânica do Rio Grande do Sul, Caixa Postal 1188, 90001-970, Porto Alegre, Rio Grande do Sul, Brasil

This paper describes and illustrates Aulacoseira brasiliensis Tremarin, Torgan et T. Ludwig sp. nov. under light and electron microscopy and compares their ultrastructure with similar species obtained from Hustedt's collection samples. The new species is characterized by forming short chains linked by ovate-attenuate spines, rounded areolae occluded by vola, undeveloped ringleist and sessile rimoportulae arranged in two circumferential alternate rows. The spines shape, rimoportulae disposition, valve surface and mantle areolation pattern are very particular. The ultrastructural features of the frustules of A. brasiliensis are compared with those of A. muzzanensis, A. agassizii var. agassizzi and A. agassizii var. malayensis, particularly with respect to the areolation pattern, position, number and shape of rimoportulae. A. brasiliensis was found in lotic and lentic environments of tropical and subtropical regions from Brazil.

Keywords: A. agassizii, A. muzzanensis, Brazil, centric diatom, freshwater, taxonomy

Received: May 11, 2011; Accepted: September 29, 2011; Published: September 1, 2012  Show citation

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Izabel Tremarin, P., Alvim Veiga Ludwig, T., & Torgan, L.C. (2012). Ultrastructure of Aulacoseira brasiliensis sp. nov. (Coscinodiscophyceae) and comparison with related species. Fottea, 12(2), 171-188. doi: 10.5507/fot.2012.013
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