학술논문
The transfer of Fragilaria obtusa Hustedt to the genus Staurosira Ehrenberg (Bacillariophyceae).
Document Type
Article
Author
Source
Subject
*FRAGILARIACEAE
*DIATOMS
*PHYTOPLANKTON
*ALGAE
*PHYCOLOGY
*FRESHWATER ecology
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Language
ISSN
1322-0829
Abstract
The ultra-structure of the frustule of the rarely recorded diatom Fragilaria obtusa Hustedt was studied in detail using sand samples from Laranjal Bay (Lagoa dos Patos Rio Grande do Sul State, Brazil). F. obtusa is transferred to the genus Staurosira Ehrenberg as Staurosira obtusa (Hustedt) Garcia. The taxon is characterized by striae composed of elliptical areolae that are occluded by an internal velum, apical pore field formed by several rows of rimmed pores, girdle bands free of ornamentation, wide valvocopulae, and absence of rimoportulae. This is the first record of S. obtusa from an epipsammic habitat. [ABSTRACT FROM AUTHOR]