Key to the species of Pareuchiloglanis in the Yangtze River in China

1. Adipose fin confluent with caudal fin......................................................................2

- Adipose fin not confluent with caudal fin......................................................................... 3

2. Predorsal length more than 3.0 times in SL, caudal peduncle slender, its depth 1.4–1.9 times in its length (upper reaches Qingy- ijiang and Minjiang Rivers)...................................................... Pareuchiloglanis sichuanensis

- Predorsal length less than 3.0 times in SL, caudal peduncle deeper, caudal peduncle depth 1.7–2.1 times in its length (upper reaches of Qingyijiang River).................................................... Pareuchiloglanis tianquanensis

3. Distance between anal- and pelvic-fin origins shorter than that between anal- and caudal-fin origins....................4

- Distance between anal- and pelvic-fin origins equal to that between anal- and caudal-fin origins.......................5

4. Caudal peduncle depth 2.7–3.1 times of its length, pectoral fin not reaching origin of ventral fin (Jinshajiang, Daduhe, Qingyi- jiang and Minjiang Rivers)........................................................... Pareuchiloglanis robusta

- Caudal peduncle depth 6.5–8.4 times of its length, pectoral fin reaching to or exceeding origin of ventral fin (Jinshajiang, Daduhe, Qingyijiang, Baishuijiang and Bailongjiang Rivers).............................. Pareuchiloglanis anteanalis

5. Posterior end of nasal not reaching anterior margin of orbital, lower angle of gill opening opposite to base of 2nd or 3rd branched pectoral-fin ray, tip of ventral fin almost reaching or reaching anus (Jinshajiang, Daduhe, Baishuijiang Rivers)..................................................................................... Pareuchiloglanis sinensis

- Posterior end of nasal reaching anterior margin of orbital, lower angle of gill opening opposite to base of the 4th or 5th branched pectoral-fin ray, tip of ventral fin falling distictly short of anus (Lishui River)..... Pareuchiloglanis hupingshanensis