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.

[1] Its maximum length is 10 cm (3.9 in).

[2] Variations in nucleotide sequences within the mitochondrial control region show strong geographic structuring suggestive of a cryptic species complex.

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