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Issue: Vol. 236 No. 3: 1 December 2015
Type: Article
Published: 2015-12-01
DOI: 10.11646/phytotaxa.236.3.6
Page range: 257–265
Abstract views: 29
PDF downloaded: 1

Oricymba tianmuensis sp. nov., a new cymbelloid species (Bacillariophyceae) from Tianmu Mountain in Zhejiang Province, China

Laboratory of Aquatic Ecology and Environmental Restoration, College of Fisheries and Life Science, Shanghai Ocean University, Shanghai 201306, P. R. China. Museum of Natural History and Department of Ecology and Evolutionary Biology, University of Colorado, Boulder, CO 80309 USA.
State Key Laboratory of Lake Science and Environments, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China.
Museum of Natural History and Department of Ecology and Evolutionary Biology, University of Colorado, Boulder, CO 80309 USA.
Laboratory of Aquatic Ecology and Environmental Restoration, College of Fisheries and Life Science, Shanghai Ocean University, Shanghai 201306, P. R. China. Water Environment & Ecology Engineering Research Center of Shanghai Institution of Higher Education, Shanghai 201306, P. R. China.
Laboratory of Aquatic Ecology and Environmental Restoration, College of Fisheries and Life Science, Shanghai Ocean University, Shanghai 201306, P. R. China. Water Environment & Ecology Engineering Research Center of Shanghai Institution of Higher Education, Shanghai 201306, P. R. China.
taxonomy morphology diatoms new species Oricymba Tianmu Mountain Algae China

Abstract

During a survey of freshwater diatoms from streams in the west region of the Tianmu Mountains, Zhejiang Province, China, a new Oricymba species, Oricymba tianmuensis sp. nov. has been recorded. A detailed morphology description of O. tianmuensis is presented, based on light and scanning electron microscopy. Oricymba tianmuensis sp. nov. is characterized by a ridge along the valve face typical of the genus, as well as a linear-lanceolate, symmetrical or slightly dorsiventral outline with a gibbous central portion gradually tapering or nearly paralleling towards the bluntly cuneate poles, a distinct rhombic-lanceolate asymmetric central area with a distinct stigma on the ventral side of the central nodule, a slightly lateral raphe with widened proximal endings and strongly deflected distal endings, and weakly radiate striae. Morphological features of the taxon are compared with similar species, and the biogeography of the genus is summarized.