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Issue: Vol. 375 No. 4: 14 November 2018
Type: Article
Published: 2018-11-14
DOI: 10.11646/phytotaxa.375.4.3
Page range: 274–282
Abstract views: 19
PDF downloaded: 1

Gomphonema bicepiformis sp. nov., a new diatom species (Bacillariophyta) from a stream in Zhejiang, China

1Centre for Research on Environmental Ecology and Fish Nutrition (CREEFN) of the Ministry of Agriculture, Shanghai Ocean University, Shanghai 201306, China. 2Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources，Shanghai Ocean University), Ministry of Education, Shanghai 201306, China. 3National Demonstration Center for Experimental Fisheries Science Education (Shanghai Ocean University) , Shanghai 201306, China.
1Centre for Research on Environmental Ecology and Fish Nutrition (CREEFN) of the Ministry of Agriculture, Shanghai Ocean University, Shanghai 201306, China.
4.Museum of Natural History and Department of Ecology and Evolutionary Biology, University of Colorado, Boulder, CO 80309 USA. 5.School of Life Science, Shanxi University, Taiyuan 030006, China
1.Centre for Research on Environmental Ecology and Fish Nutrition (CREEFN) of the Ministry of Agriculture, Shanghai Ocean University, Shanghai 201306, China. 2.Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources，Shanghai Ocean University), Ministry of Education, Shanghai 201306, China. 3.National Demonstration Center for Experimental Fisheries Science Education (Shanghai Ocean University) , Shanghai 201306, China.
1.Centre for Research on Environmental Ecology and Fish Nutrition (CREEFN) of the Ministry of Agriculture, Shanghai Ocean University, Shanghai 201306, China. 2.Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources，Shanghai Ocean University), Ministry of Education, Shanghai 201306, China. 3.National Demonstration Center for Experimental Fisheries Science Education (Shanghai Ocean University) , Shanghai 201306, China.
Taxonomy new species Gomphonema morphology China Algae

Abstract

During a survey of freshwater diatoms from Shibadukeng stream in the Xianju County, Zhejiang Province, China, a new gomphonemoid species, Gomphonema bicepiformis sp. nov. has been recorded. The new species is diagnosed from all others in the genus based on morphology as observed with both light and scanning electron microscopy. Valves of Gomphonema bicepiformis are lanceolate with a gibbous central region. The headpole is broadly rounded, clearly capitate and the footpole is also broadly rounded, capitate. The axial area is wide, lanceolate-rhombic, broad at mid-valve, reaching 3/4 of the total breadth. There are circular to irregularly-shaped depressions in the axial area on the exterior of the valve surface often appearing as light spots in LM. The new species was compared with G. biceps, G. obstipum, G. manubrium, G. pyrenaicum, G. guayabense and G. nipponica, all of which resemble Gomphonema bicepiformis in outline, but differ from the new species in specific details of size, striae density, and extent of the axial area. This species occurs in relatively low conductivity and clean water in Zhejiang, China.