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

Diatom Research

By:
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DOI: 10.1080/0269249X.2014.927006

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Abstract

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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Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Morphology, ecology and biogeography of Stauroneis pachycephala P.T. Cleve (Bacillariophyta) and its transfer to the genus Envekadea
Series title:
Diatom Research
DOI:
10.1080/0269249X.2014.927006
Volume
29
Issue:
4
Year Published:
2014
Language:
English
Publisher:
Taylor & Francis
Contributing office(s):
St. Petersburg Coastal and Marine Science Center
Description:
10 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Diatom Research
First page:
455
Last page:
464
Country:
Australia;South Africa;United States
State:
Florida;Louisiana;Victoria
City:
Port Elizabeth
Other Geospatial:
Baakens River;Everglades;Mackenzie River