Glyptothorax
Creators: name: Ng, Heok Hee
name: Kottelat, Maurice
Publisher: name: Zenodo
Year: 2016
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Actinopterygii
Siluriformes
Sisoridae
Glyptothorax

description: Key to the Glyptothorax species of Sundaic Southeast Asia
1. Body uniformly dark, with a prominent pale midlateral stripe................................................... 2
- Body mottled or uniform, without prominent pale midlateral stripe.............................................. 4
2. Thoracic adhesive apparatus short, not reaching to the level of the last pectoral-fin-ray bases.......................... 3
- Thoracic adhesive apparatus long, reaching to or just beyond the level of the last pectoral-fin-ray bases [central Sumatra, Malay Peninsula].............................................................................. G. schmidti
3. Head length 22.6–23.6% SL; caudal peduncle depth 5.8–7.3% SL; preanal vertebrae 19–20 [Danau Toba drainage in northern Sumatra]................................................................................... G. famelicus
- Head length 24.0–25.5% SL; caudal peduncle depth 7.6–8.9% SL; preanal vertebrae 16–17 [Alas River drainage in northern Sumatra].................................................................................... G. ketambe
4. Presence of anteromedial striae in the thoracic adhesive apparatus in the thoracic adhesive apparatus (Fig. 1)............. 5
- No anteromedial striae in the thoracic adhesive apparatus..................................................... 8
5. Prominent dark vertical mark at base of caudal fin in shape of irregular cross [Kayan River drainage in northeast Borneo].............................................................................................. G. decussatus
- Base of caudal fin without dark vertical mark............................................................... 6
6. Anterolateral edge of thoracic adhesive apparatus gently convex; sides of body with prominent, enlarged tubercles [Alas River drainage in northern Sumatra].................................................................... G. plectilis
- Anterolateral edge of thoracic adhesive apparatus straight or markedy concave; sides of body without prominent, enlarged tubercles............................................................................................ 7
7. Anterolateral edges of thoracic adhesive apparatus almost straight; caudal peduncle depth 9.8–11.2% SL [central Sumatra].............................................................................................. G. amnestus
- Anterolateral edges of thoracic adhesive apparatus markedly concave; caudal peduncle depth 7.7–10.1% SL [southern, west- ern, northern and northeastern Borneo]............................................................... G. major
8. Medial pit in thoracic adhesive apparatus absent; caudal fin with prominent dark longitudinal stripes running through each lobe [western Java and southern Sumatra].............................................................. G. robustus
- Medial pit in thoracic adhesive apparatus present; caudal fin without prominent dark longitudinal stripes running through each lobe................................................................................................ 9
9. Prominent pale patches on body......................................................................... 10
- No prominent pale patches on body...................................................................... 12
10. Body depth at anus 15.4–20.2% SL; caudal peduncle depth 8.4–10.9% SL; prominent dark vertical bars at level of adipose-fin base and base of caudal fin present [southern Borneo]................................................... G. pictus
- Body depth at anus 12.1–15.8% SL; caudal peduncle depth 6.5–7.9% SL; prominent dark vertical bars at level of adipose-fin base and base of caudal fin absent....................................................................... 11
11. Premaxillary toothband almost entirely exposed when mouth is closed [Kapuas River drainage in western Borneo]...................................................................................................... G. exodon
- Premaxillary toothband two-thirds exposed when mouth is closed [central Sumatra, Malay Peninsula].... G. platypogonides
12. Body uniformly colored, without dark spots; dorsoposterior margin of adipose fin convex........................... 13
- Body mottled, with dark spots; dorsoposterior margin of adipose fin straight...................................... 14
13. Pectoral-fin spine length 19.4–22.9% SL; caudal-fin length 26.9–30.7% SL [Sumatra]......................... G. keluk
- Pectoral-fin spine length 13.6–17.9% SL; caudal-fin length 20.1–27.0% SL [Java]........................ G. platypogon
14. Body strongly tapering posteriorly (caudal peduncle depth 3.4–3.8 times in body depth at dorsal-fin origin); posterior margin of dorsal spine serrated [western and northwestern Borneo]............................................ G. stibaros
- Body not strongly tapering posteriorly (caudal peduncle depth 2.1–2.8 times in body depth at dorsal-fin origin); posterior mar- gin of dorsal spine smooth............................................................................. 15
15. Margin of dorsal fin concave [eastern and southern Borneo]........................................ G. nieuwenhuisi
- Margin of dorsal fin straight............................................................................ 16
16. Snout acutely rounded when viewed dorsally; expanded distal tips of neural spines forming series of low bumps anterior to adipose fin; caudal fin with uniform color pattern without hyaline areas and pointed lobes [southeastern Thailand, Malay Pen- insula, central and southern Sumatra]................................................................ G. fus cus
- Snout broadly rounded when viewed dorsally; expanded distal tips of neural spines not forming series of low bumps anterior to adipose fin; caudal fin with with hyaline areas in median fin rays and tips of fin lobes and acutely rounded [northern Malay Peninsula]................................................................................... G. prashadi
description: Published as part of Ng, Heok Hee & Kottelat, Maurice, 2016, The Glyptothorax of Sundaland: a revisionary study (Teleostei: Sisoridae), pp. 1-92 in Zootaxa 4188 (1) on pages 86-87, DOI: 10.11646/zootaxa.4188.1.1, http://zenodo.org/record/165406