Yaoshania pachychilus, the panda loach, is a species of gastromyzontid loach endemic to mountain streams in Jinxiu County, Guangxi in China. This species grows to a length of 5.8 centimetres (2.3 in) SL. This species is monotypic, but it was formerly included in Protomyzon. Juveniles are strikingly coloured in black-and-white, but adults are relatively plain. Y. pachychilus quickly became a popular aquarium fish in the 2010s.