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Description of A New Species of the Gudgeon Genus Microphysogobio Mori 1934 (Cypriniformes: Cyprinidae) from Guangdong Province, Southern China.

Shih-Pin Huang, I-Shiung Chen, Yahui Zhao, and Kwang-Tsao Shao (2018) Microphysogobio luhensis n. sp., a new cyprinid species, is described from the Rongjiang River in eastern Guangdong Province, China. Morphological characters and molecular evidence based on mitochondrial DNA Cytochrome b (Cyt b) and Cytochrome oxidase subunit I (COI) sequences were used to compare this new species with other related species from mainland China, Vietnam and Taiwan. The present molecular evidences revealed that this new species is closely related to M. kachekensis and M. yunnanensis. However, these three species can be well distinguished based on the number of small pearl-like papillae on their inside papillae, lip papillae shape, barbel length, barbel width and color pattern. Furthermore, the morphometric comparison between M. kachekensis and the poorly known species M. yunnanensis is also discussed in this study for the first time. In addition, a diagnostic key to all 14 valid species of Microphysogobio from southern mainland China, Hainan Island and Taiwan is also provided.