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Abstract

A new freshwater goby of Rhinogobius Gill (1859) was collected from the Wangchuang River basin, Hainan Island, southern China. The new species, Rhinogobius sangenloensis, can be well distinguished from other congeners by a combination of the following features: second dorsal-fin rays modally I/8; anal-fin rays I/7-8; pectoral-fin rays modally 17; longitudinal scales 25-27; predorsal scales 9-11; vertebrae 26; body with 3-4 longitudinal, discontinuous orange to brown or brownish black bars and stripes; cheek with 2 grayish black spots in male; pectoral-fin base in male with 2 oblong black bars; caudal fin with an orange mark on lower 1/3 region in male. An artificial key to six species of Rhinogobius from Hainan Island is also provided.

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