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Issue: Vol. 327 No. 3: 10 November 2017
Type: Article
Published: 2017-11-10
DOI: 10.11646/phytotaxa.327.3.5
Page range: 261–268
Abstract views: 22
PDF downloaded: 1

Morphology and ultrastructure of Sellaphora constrictum sp. nov. (Bacillariophyta), a new diatom from southern China

College of Life and Environmental Sciences, Shanghai Normal University, Shanghai, China Museum of Natural History, University of Colorado, Boulder, CO, USA
Museum of Natural History, University of Colorado, Boulder, CO, USA Department of Ecology and Evolutionary Biology, University of Colorado, Boulder, CO, USA University of Michigan Biological Station, Pellston, MI, USA
College of Life and Environmental Sciences, Shanghai Normal University, Shanghai, China
University of Michigan Biological Station, Pellston, MI, USA Department of Biological Sciences, Bowling Green State University, Bowling Green, OH, USA
College of Life Science and Technology, Harbin Normal University, Harbin, China
College of Life and Environmental Sciences, Shanghai Normal University, Shanghai, China
karst region new species taxonomy Wuzhishan Algae

Abstract

A new diatom species, Sellaphora constrictum sp. nov., is reported from a karst landform in the Maolan Nature Reserve, Guizhou Province, China. Valves of the new species are broadly linear, slightly constricted in the middle part of the margins and have round apices, an undulate filiform to lateral raphe, a narrow axial area and a narrow conopeum bordering axial area on each side. This species also has undulate ridges along the margin and near the center of the valve, giving the impression of longitudinal ridges on either side of the axial area under light microscopy. Internally, a round opening is present in the apex of the valve, and thickened transverse bars are absent in this region. There are two types of areolae on the valve exterior. Together these features distinguish the new species from all others currently assigned to the genus. We discuss the growing number of new species and genera from freshwater environments in China, and interpretations about the delineation of the genus Sellaphora.