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BackgroundThe genus    Homatula    belongs to the order   Cypriniformes   and family   Nemacheilidae  . Nichols (1925) set up the genus as a subgenus of    Barbatula    by the type species of    Nemacheilus   potanini   . Currently, it is recognised as a valid genus. Nineteen valid species have been already reported in the drainage of the Yellow, Yangtze, Pearl, Lancang, Red and Nujiang Rivers.    H.   variegata   ,    H.   longidorsalis   ,    H.   berezowskii    and    H.   potanini    are distributed in the Yangtze River drainage in China.    H.   laxiclathra    is mainly distributed in the Weihe River, a tributary of the Yellow River. The remaining species are mainly distributed in the rivers of Yunnan Province.New informationHomatula   guanheensis    sp. nov., a new species, is described from the Guanhe River of the HanJiang River drainage (a tributary of the Yangtze River), Xixia County, Henan Province, China. It can be distinguished from its congeners by a combination of the following characters: the vertical brown bars on the body are wider than their interspaces, numbering 19–22; predorsal body partially scaled; the lateral line complete; adipose crest on caudal peduncle not reaching forward; the position of the anal-fin origin and the intestinal form. The new species displays distinct molecular divergence in the Cytochrome oxidase I (COI) and Cytochrome b (Cyt  b ) genes.

Homatula guanheensis sp. nov. ( Teleostei : Nemacheilidae ), a new species of loach from Henan Province, China