Frustule morphology of the planktonic pennate diatom Fragilaria gessneri Hustedt (Bacillariophyta) from the Florida coast of the Gulf of Mexico, with a description of Desikaneis gen. nov

Autor:	A. K. S. K. Prasad, R. J. Livingston
Rok vydání:	1993
Předmět:	geography geography.geographical_feature_category biology Frustule Ecology Drainage basin Zoology Plant Science Aquatic Science Plankton biology.organism_classification Fragilaria Diatom Algae Phytoplankton Taxonomy (biology)
Zdroj:	Phycologia. 32:434-443
ISSN:	2330-2968 0031-8884
DOI:	10.2216/i0031-8884-32-6-434.1
Popis:	A planktonic araphid diatom, Fragilaria gessneri Hustedt, originally described from Venezuela, was encountered in plankton samples from the north Horida coast of the Gulf of Mexico and examined with SEM. F. gessneri showed valve and cingulum details different from those of Fragilaria capucina Desmazieres, the generitype. Differences include central stauros, apical slit fields, vola-type occlusions on the areolae, striae aligned across the sternum and rudimentary median septa on the valvocopula. It is transferred to a new genus Desikaneis. Affinities with other closely related araphid diatoms are discussed. Fragilaria leptostauron var. stauroneiformis Woodhead et Tweed is transferred to Desikaneis and treated as a distinct species, D. stauroneiformis stat. et comb. nov. The extinct species Fragilaria riesgoviensis Schauderna is transferred to Desikaneis and a new species, D. howellii, collected from north Horida's drainage basins, is described.
Databáze:	OpenAIRE
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