Hemimyzon Regan 1911

An artificial key to 5 endemic species Hemimyzon in Taiwan: 1a Dorsal fin rays 3+7......................................................................... H. formosanus 1b Dorsal fin rays 3+8.................................................................................... 2 2a Pelvic fin rays 17; inner gap between pelvic fins very narrow....................................... H. taitungensis 2b Pelvic fin rays no more than 15; inner gap between pelvic fins wider than......................................... 3 3a Pelvic fin simple rays modally 3, total rays always 11.............................................. H. luae n. sp. 3b Pelvic fin simple rays modally 4, total rays always 14........................................................ 4 4a Pectoral fin rays 24; lateral-line scales 78–80; the distance of pelvic rear tip to anus about 3 times to that of anus to anal fins.............................................................................................. H. sheni 4b Pectoral fin rays modally 22; lateral-line scales 69–72; the distance of pelvic rear tip to anus about 1.2–1.8 times to that of anus to anal fins............................................................................... H. yushanensis