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Issue: Vol. 408 No. 3: 1 July 2019
Type: Article
Published: 2019-07-01
DOI: 10.11646/phytotaxa.408.3.2
Page range: 161–177
Abstract views: 19
PDF downloaded: 1

New Aulacoseira species (Bacillariophyta) from the Argentinean Patagonia and re-examination of type material of Melosira perpusilla Frenguelli

Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Biodiversidad y Biología Experimental. Buenos Aires, Argentina. CONICET. Instituto de Biodiversidad y Biología Experimental Aplicada (CONICET – UBA). Buenos Aires, Argentina.
Water Laboratory, University of Évora, P.I.T.E. Rua da Barba Rala No. 1, 7005-345 Évora, Portugal. Institute of Earth Sciences - ICT, University of Évora, Rua Romão Ramalho n°. 59, 7000-671 Évora, Portugal.
División Ficología, Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, Paseo del Bosque s/nº, 1900 La Plata, Argentina.
Acqua Diagnósticos Ambientais Ltda. Rua Lourenço Volpi, nº 813, sob. 05, Santa Cândida 82640–440. Curitiba, Paraná, Brazil.
Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Biodiversidad y Biología Experimental. Buenos Aires, Argentina. CONICET. Instituto de Biodiversidad y Biología Experimental Aplicada (CONICET – UBA). Buenos Aires, Argentina.
Centric diatoms freshwater morphology SEM South America ultrastructure Algae

Abstract

We present a detailed morphological analysis with light and scanning electron microscopy of two new small Aulacoseira species occurring in lacustrine sediments from small lakes in the provinces of Santa Cruz and Neuquén (Patagonia, Argentina). These species differ from similar taxa by unique combinations of characters. Aulacoseira lauquenensis sp. nov. can be differentiated by its broad collum, deep and solid ringleist and presence of short, spatulate and forked-tip spines. Aulacoseira liucoensis sp. nov. is distinguished by the presence of a marginal row of valve face areolae, straight mantle rows of coarse areolae, developed collum, protruding ringleist and conical, anchor-tip spines. Additionally, we re-examine the type material of Melosira perpusilla Frenguelli and present an analysis of its identity.