B. Van de Vijver, K. Kopalova, J. Kociolek, and L. Ector
Fottea, vol. 15, no. 1, pp. 105-111, 2015
During a survey of the freshwater diatom flora of James Ross Island (northern Weddell Sea) in the Maritime Antarctic Region, an unknown <i>Denticula</i> taxon was found in some lakes of Clearwater Mesa. The taxon showed some similarities with <i>D. rainierensis</i> Sovereign and <i>D. subtilis</i> 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: <i>D. jamesrossensis</i> 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.