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Morphology, ecology and biogeography of Stauroneis pachycephala PT Cleve (Bacillariophyta) and its transfer to the genus Envekadea
Journal article   Open access   Peer reviewed

Morphology, ecology and biogeography of Stauroneis pachycephala PT Cleve (Bacillariophyta) and its transfer to the genus Envekadea

Islam Atazadeh, Mark B. Edlund, Bart Van der Vijver, Keely Mills, Sarah A. Spaulding, Peter A. Gell, Simon Crawford, Andrew F. Barton, Sylvia S. Lee, Kathryn E. L. Smith, …
Diatom research, v 29(4), pp 455-464
01 Jan 2014
url
http://nora.nerc.ac.uk/id/eprint/508853/1/Atazadeh%20et%20al%20%282014%29.pdfView
Accepted (AM)Open Access (License Unspecified) Open

Abstract

Life Sciences & Biomedicine Marine & Freshwater Biology Science & Technology
Stauroneis pachycephala was described in 1881 from the Baakens River, Port Elizabeth, South Africa. Recently, it was found during surveys of the MacKenzie River (Victoria, Australia), the Florida Everglades (USA) and coastal marshes of Louisiana (USA). The morphology, ecology and geographic distribution of this species are described in this article. This naviculoid species is characterised by lanceolate valves with a gibbous centre, a sigmoid raphe, an axial area narrowing toward the valve ends, and capitate valve apices. The central area is a distinct stauros that is slightly widened near the valve margin. The raphe is straight and filiform, and the terminal raphe fissures are strongly deflected in opposite directions. Striae are fine and radiate in the middle of the valve, becoming parallel and eventually convergent toward the valve ends. The external surface of the valves and copulae is smooth and lacks ornamentation. We also examined the type material of S. pachycephala. Our observations show this species has morphological characteristics that fit within the genus Envekadea. Therefore, the transfer of S. pachycephala to Envekadea is proposed and a lectotype is designated.

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Domestic collaboration
International collaboration
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Marine & Freshwater Biology
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