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Issue: Vol. 393 No. 1: 20 February 2019
Type: Article
Published: 2019-02-20
DOI: 10.11646/phytotaxa.393.1.5
Page range: 57–66
Abstract views: 27
PDF downloaded: 1

Delicata chongqingensis sp. nov., a new cymbelloid diatom species (Bacillariophyceae) from Daning River, Chongqing, China

Gansu Engineering Technology Research Center for Microalgae, Key Laboratory of Hexi Corridor Resources Utilization of Gansu, Hexi University, Gansu 734000, P.R. China
Centre for Research on Environmental Ecology and Fish Nutrition (Ministry of Agriculture, China), Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources (Ministry of Education, China), National Demonstration Center for Experimental Fisheries Science Education, Shanghai Ocean University, Shanghai 201306, P.R. China
Diatom Lab. IMARENABIO, La Serna, 58, 24007 León, Spain
Department of Natural Sciences, National Museum of Wales, Cathays Park, Cardiff CF103NP, UK
Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), Chongqing Key Laboratory of Plant Ecology and Resources Research in Three Gorges Reservoir Region, School of Life Science, Southwest University, Chongqing 400715, P.R. China
Algae Delicata Cymbellales taxonomy morphology new species China

Abstract

A new Delicata species, Delicata chongqingensis sp. nov. was found during a survey of freshwater diatoms in the Daning River, Chongqing municipality, China. A detailed morphological description of D. chongqingensis is presented, based on light and scanning electron microscopy. Delicata chongqingensis has dorsiventral, semi-lanceolate valves with a moderately and evenly arched dorsal margin, a straight ventral margin in the central section, and slightly protracted, rounded ends. The central area is a large, irregular semifascia on the dorsal side, bordered by 2–4 shorter central striae. The morphology of the taxon is compared to Delicata sinensis, another species from China with a dorsal semifascia, and other species in the genus. Ecological data including water chemistry and co-occurring diatom taxa are provided for the locations where the new species was found.