Hemimyzon formosanus

{{Short description|Species of fish}}

{{Speciesbox

| image =

| taxon = Hemimyzon formosanus

| authority = (Boulenger, 1894)

| synonyms = *Homaloptera formosana Boulenger, 1894

}}

Hemimyzon formosanus is a species of hillstream loach (a ray-finned fish) in the genus Hemimyzon. It is endemic to western portion of Central Mountain Range of Taiwan.{{cite web |url=http://fishdb.sinica.edu.tw/eng/species.php?id=380991 |title=Hemimyzon formosanus |author=Shao, Kwang-Tsao |work=The Fish Database of Taiwan. WWW Web electronic publication. Version 2009/1 |publisher= |accessdate=27 November 2012}} Its maximum length is {{convert|10|cm|abbr=on}}.{{FishBase|Hemimyzon|formosanus|month=November|year=2012}} Variations in nucleotide sequences within the mitochondrial control region show strong geographic structuring suggestive of a cryptic species complex.{{Cite journal| volume = 46 | pages = 547–560 | last = Wang | first = T. Y. |author2=T. Y. Liao |author3=C. S. Tzeng | title = Phylogeography of the Taiwanese endemic hillstream loaches, Hemimyzon formosanus and H. taitungensis (Cypriniformes: Balitoridae) | journal = Zoological Studies

| year = 2007}}