Oreoglanis Smith 1933
Creators: name: Suvarnaraksha, Apinun
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Actinopterygii
Siluriformes
Sisoridae
Oreoglanis

description: Key to the species of Oreoglanis   
Adapted and modified from Ng & Kottelat, 1999; Ng & Freyhof, 2001; Ng & Rainboth, 2001; Ng, 2004; Chen et al., 2017; Kong et al., 2007; Vidthayanon et al., 2009; Linthoingambi & Vishwanath, 2011; Sinha & Tamang, 2015; Chen et al., 2017. Note: CP = Chao Phraya River basin, MK = Mekong River basin, SW = Salween River basin, ID = Irrawaddy River basin, BP = Brahmaputra River basin, SL = Song Lam River basin.  
1. Lower lip notched medially, with entire or weakly laciniate posterior margin; emarginate caudal-fin.................................2  
– Lower lip lacking a median notch, with prominent projections along posterior margin; laciniate caudal-fin with principal caudal rays extended.........................................................................16  
2. Pectoral-fin not reaching to pelvic-fin origin.........................3  
– Pectoral-fin reaching or surpassing pelvic-fin origin.............5  
 3. Head width 90.2–96.8%HL, post-adipose distance 5.7–8.8%SL and dorsal-fin high 15.4–20.3%SL................ O. sudarai (CP)   
– Head width 79.3–87.4%HL, post-adipose distance 8.4–14.3%SL and dorsal-fin high 11.4–14.4%SL.........................................4  
 4. Caudal peduncle length and caudal peduncle depth ratio 4.9–8.4, adipose-fin base 29.1–36.7%SL and head 15.3–17.7%SL............................................................................ O. siamensis (CP)   
 – Caudal peduncle length and caudal peduncle depth ratio 2.1–3.3, adipose-fin base 35.6–39.5%SL and head 18.7–22.9%SL....................................................  O. omkoiense, new species  (CP)   
 5. Branched anal-fin rays 2...................... O. heteropogon (SW)   
– Branched anal-fin rays 3–6.....................................................6  
6. Caudal-fin lunate.....................................................................7  
– Caudal-fin emarginate.............................................................8  
 7. Adipose-fin base length 24.2–29.7%SL, dorsal-fin base length 6.6–9.2%SL, anal-fin base length 2.5–3.6%SL..................................................................................... O. jingdongensis (MK)   
 – Adipose-fin base length 30.7–38.1%SL, dorsal-fin base length 10.9–13.7%SL, anal-fin base length 5.6–7.6%SL...................................................................................... O. suraswadii (MK)   
 8. Caudal-fin rays 5+5.............................. O. hponkangensis (ID)   
– Caudal-fin rays 6+6 or 7+8 or 8+7........................................9  
 9. Posterior margin of maxillary barbel with laciniate projections...................................................... O. setiger (MK)   
– Posterior margin of maxillary barbel without or with lobulated projections.............................................................................10  
 10. Caudal peduncle depth 8.0–8.7%SL....... O. macropterus (ID)   
– Caudal peduncle depth 3.0–6.3%SL.....................................11  
 11. Small eye 7.7–8.8%HL................................... O. insignis (ID)   
– Larger eye 9.0–13.7%HL......................................................12  
12. Branched anal-fin rays 3.......................................................13  
– Branched anal-fin rays 4–6...................................................14  
 13. Post adipose-fin length 6.5–9.0%SL..... O. immaculatus (SW)   
 – Post adipose-fin length 9.9–10.8%SL....... O. majusculus (BP)   
 14. Dorsal to adipose-fin distance 21.1%SL................................................................................................... O. pangenensis (BP)   
 – Dorsal to adipose-fin distance 14.4–16.0%SL............................................................................................ O. laciniosus (SW)   
 15. Maxillary barbel tip pointed........................... O. colurus (CP)   
– Maxillary barbel tip rounded................................................16  
 16. Branched dorsal-fin rays 7.................... O. macronemus (MK)   
– Branched dorsal-fin rays 5–6................................................17  
17. Post adipose distance short 2.8–7.0%SL..............................18  
– Post adipose distance short more than 7.0%SL...................19  
 18. Emarginate caudal-fin shape..................... O. tenuicauda (CP)   
 – Lunate caudal-fin shape.................................. O. vicinus (CP)   
19. Branched caudal-fin rays 7+7...............................................20  
– Branched caudal-fin rays 5–6+6–7, 7–6...............................22  
 20. Long pre-dorsal length 36.1–37.1%SL........ O. lepturus (MK)   
– Pre-dorsal length short 30.8–36.5%SL.................................21  
 21. Anal-fin base length 2.7–3.6%SL, caudal peduncle length 18.7–21.7%SL, head width 18.9–22.4 %SL................................................................................................ O. hypsiurus (MK)   
 – Anal-fin base length 3.6–4.9%SL, caudal peduncle length 21.5–24.0 %SL, head width 16.4–20.8%SL................................................................................................ O. delacouri (MK)   
 22. Post-adipose distance 9.0–13.8%SL, head depth 9.3–13.5%SL and pre-pelvic length 38.9–44.0%SL.... O. nakasathiani (CP)   
– Post-adipose distance 6.8–8.9%SL, head depth 7.3–8.0%SL and pre-pelvic length 33.1–9.4%SL.....................................23  
 23. Branched dorsal-fin rays 6, small eye 7.5–9.8%HL, adipose-fin base length 36.7–47.8%SL, pectoral-fin length 23.0–24.4%SL and head length 18.8–20.7%SL................... O. frenatus (MK)   
 – Branched dorsal-fin rays 5, small eye 10.5–12.1%HL, adipose-fin base length 31.7–36.0%SL, pectoral-fin length 25.3–26.4%SL and head length 21.4–24.7%SL.............................................................................................. O. infulatus (SL)
description: Published as part of Suvarnaraksha, Apinun, 2020, Oreoglanis omkoiense: a new torrent catfish from northern Thailand (Pisces: Siluriformes, Sisoridae), pp. 779-790 in Raffles Bulletin of Zoology 68 on page 780, DOI: 10.26107/RBZ-2020-0089, http://zenodo.org/record/5350342