Skip to main content Skip to main navigation menu Skip to site footer
Responsive image
Issue: Vol. 340 No. 1: 21 February 2018
Type: Article
Published: 2018-02-21
DOI: 10.11646/phytotaxa.340.1.4
Page range: 63–70
Abstract views: 45
PDF downloaded: 1

Oricymba rhynchocephala sp. nov., a new cymbelloid diatom (Bacillariophyceae) from Xianju National Park in Zhejiang Province, China

Centre for Research on Environmental Ecology and Fish Nutrion (CREEFN) of the Ministry of Agriculture, Shanghai Ocean University, Shanghai 201306, China. Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources (Shanghai Ocean University), Ministry of Education, Shanghai 201306, China. National Demonstration Center for Experimental Fisheries Science Education (Shanghai Ocean University) , Shanghai 201306, China.
Centre for Research on Environmental Ecology and Fish Nutrion (CREEFN) of the Ministry of Agriculture, Shanghai Ocean University, Shanghai 201306, China. Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources (Shanghai Ocean University), Ministry of Education, Shanghai 201306, China.
Museum of Natural History and Department of Ecology and Evolutionary Biology, University of Colorado, Boulder, CO 80309 USA.
Centre for Research on Environmental Ecology and Fish Nutrion (CREEFN) of the Ministry of Agriculture, Shanghai Ocean University, Shanghai 201306, China. Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources (Shanghai Ocean University), Ministry of Education, Shanghai 201306, China. National Demonstration Center for Experimental Fisheries Science Education (Shanghai Ocean University) , Shanghai 201306, China.
Centre for Research on Environmental Ecology and Fish Nutrion (CREEFN) of the Ministry of Agriculture, Shanghai Ocean University, Shanghai 201306, China. Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources (Shanghai Ocean University), Ministry of Education, Shanghai 201306, China. National Demonstration Center for Experimental Fisheries Science Education (Shanghai Ocean University) , Shanghai 201306, China.
taxonomy morphology diatoms new species Oricymba Xianju National Park Algae

Abstract

During a survey of freshwater diatoms from Xuedong stream in the Xianju National Park, Zhejiang Province, China, a new cymbelloid species, Oricymba rhynchocephala sp. nov. has been recorded. This species is assigned to the genus Oricymba by virtue of having a ridge separating the valve face and mantle, the presence of apical pore fields, stigma with a single external opening but two internal openings, and areolae with dentate occlusions. A detailed morphological description of the new species, O. rhynchocephala, is presented, based on light and scanning electron microscopy. Oricymba rhynchocephala sp. nov. is characterized by having a linear-lanceolate outline with slightly arched valve margins towards rounded and clearly rostrate apices, as well as radiate striae. The taxon is morphologically compared with similar species of the genus Oricymba. The new species, can be easily separated from other species in Oricymba by its obvious rostrate apices. The report of this new species from Zhejiang Province adds to our understanding the morphology and distribution of the genus Oricymba in China.