Fottea, 2015 (vol. 15), issue 1

Fottea 15(1): 105-111, 2015 | 10.5507/fot.2015.009

Denticula jamesrossensis, a new freshwater diatom (Bacillariophyta) species from the Maritime Antarctic Region

Bart Van de Vijver1,2, Kateřina Kopalová3, J. Patrick Kociolek4, Luc Ector5
1 Botanic Garden Meise, Department of Bryophyta & Thallophyta, Nieuwelaan 38, B-1860 Meise, Belgium; Corresponding author e-mail: vandevijver@br.fgov.be
2 University of Antwerp, Department of Biology, ECOBE, Universiteitsplein 1, B-2610 Wilrijk, Antwerpen, Belgium
3 Charles University in Prague, Faculty of Science, Department of Ecology, Viničná 7, CZ-12844 Prague 2, Czech Republic
4 University of Colorado Museum of Natural History and Department of Ecology and Evolutionary Biology, University of Colorado, Boulder, Colorado 80309, USA
5 Luxembourg Institute of Science and Technology (LIST), Department 'Environmental Research and Innovation' (ERIN), rue du Brill 41, L-4422 Belvaux, Luxembourg

During a survey of the freshwater diatom flora of James Ross Island (northern Weddell Sea) in the Maritime Antarctic Region, an unknown Denticula taxon was found in some lakes of Clearwater Mesa. The taxon showed some similarities with D. rainierensis Sovereign and D. subtilis Grunow but based on detailed light (LM) and scanning electron microscopy (SEM) the species showed sufficient morphological differences to separate it as a new species: D. jamesrossensis sp. nov. The new taxon is characterized, and distinguished from other species of the genus, by a typical constriction in the middle of the valve and a very high number of striae (up to 60 in 10 µm). So far, the new taxon has only been found on James Ross Island where it occurs in alkaline lakes with high specific conductance values.

Keywords: Denticula, Maritime Antarctic Region, morphology, new species

Received: December 12, 2014; Accepted: January 15, 2015; Published: April 22, 2015

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