Troglonectes elongatus is a species of freshwater ray-finned fish belonging to the family Nemacehilidae, the stone loaches. It inhabits Guangxi, China and has 9 dorsal soft rays, 7 anal soft rays and 38 or 39 vertebrae. Unsexed males have a maximum length of and it is considered harmless to humans. It has not been evaluated on the IUCN Red List and was described by Tang, Zhao and Zhang in 2012.
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