Cymbella loescherae sp. nov. (Bacillariophyceae) from First-Order Streams of Southern Brazil

• Main Authors: Garcia Marinês, Dutra Débora Barwaldt
• Format: Article
• Language: English
• Published: Sciendo 2016-12-01
• Series: Polish Botanical Journal
• Subjects: Cymbella aspera group; diatom; freshwater; lotic habitat; new species; Rio Grande do Sul State; South America; taxonomy
• Online Access: http://www.degruyter.com/view/j/pbj.2016.61.issue-2/pbj-2016-0026/pbj-2016-0026.xml?format=INT

This paper describes a new species of Cymbella C. Agardh from low-elevation countryside streams of the Serra do Sudeste, São Lourenço do Sul city, in southern Brazil. Cymbella loescherae M. Garcia & D. B. Dutra sp. nov. has as distinctive features the elliptical shape of stigmata, elliptical internal areolae openings, and the presence of areolae of diverse shapes (X, I, Y, zig-zag) located mainly at the valve center on the dorsal and ventral sides. It resembles C. subhimalaspera Jüttner & Van de Vijver which presents about the same metric data set, but differs from it primarily in the number and form of stigmata, and the form of areola internal openings.