Glyptothorax, IN THE SALWEEN RIVER

Jiang, Wansheng, Ng, Heok Hee, Yang, Junxing & Chen, Xiaoyong, 2012, A taxonomic review of the catfish identified as Glyptothorax zanaensis (Teleostei: Siluriformes: Sisoridae), with the descriptions of two new species, Zoological Journal of the Linnean Society 165 (2), pp. 363-389 : 385

KEY TO GLYPTOTHORAX IN THE SALWEEN RIVER DRAINAGE

1. Thoracic adhesive apparatus extending onto gular region........................................................................2

– Thoracic adhesive apparatus not extending onto gular region.................................................................. 3

2. Flanks with irregular dark blotches; head and body not prominently tuberculate; pectoral spine with seven to eight serrations; dorsal-fin base 11.0–13.2% SL; pectoral-fin length 15.6–19.6% SL; caudal peduncle depth 8.6–9.8% SL ........................................................................................................................ G. obliquimaculatus

– Flanks without prominent dark blotches; head and body prominently tuberculate; pectoral spine with ten to 12 serrations; dorsal-fin base 13.7–15.8% SL; pectoral-fin length 20.2–22.6% SL; caudal peduncle depth 6.1–7.6% SL .............................................................................................................................. G. rugimentum

3. Tooth band on upper jaw very broad, forming roof of oral cavity; thoracic adhesive apparatus with ovoid central pit............................................................................................................................... G. burmanicus

– Tooth band on upper jaw narrow, restricted on anterior margin of oral cavity; thoracic adhesive apparatus without ovoid central pit .............................................................................................................................. 4

4. Prominent pale longitudinal stripe along lateral line, broader than lateral line........................... G. trilineatus

– Prominent pale longitudinal stripe along lateral line absent, or if present, as wide as or narrower than lateral line ............................................................................................................................................... 5

5. Flanks pale or predominantly pale, with scattered dark spots frequently present........................................6

– Flanks dark, without dark spots.........................................................................................................7

6. Nuchal plate elements frequently pale and strongly contrasting with rest of predorsal region; prominent pale patches on flanks; caudal peduncle depth 6.9–7.9% SL .............................................................. G. dorsalis

– Nuchal plate elements frequently dark and not strongly contrasting with rest of predorsal region; flanks uniform or nearly so, without prominent pale patches; caudal peduncle depth 5.3–6.9% SL........................ G. ngapang

7. Flanks dark, fading to paler colour ventrally; triangular anterior nuchal plate element with concave anterolateral edges and extensive contact with posterior nuchal plate element, lacking saddle-shaped lateral extensions. ........................................................................................................................... G. fucatus sp. nov.

– Flanks uniformly dark; triangular anterior nuchal plate element either with straight anterolateral edges and lacking extensive contact with posterior nuchal plate element, or with concave anterolateral edges, extensive contact with posterior nuchal plate element and saddle-shaped lateral extensions.......................................8

8. Diverging pattern of striae running along edges of median depression in thoracic adhesive apparatus ............. ..................................................................................................................................... G. zanaensis

– Striae radiating in single series along median depression in thoracic adhesive apparatus.............................9

9. Anterior nuchal plate elements with lateral saddle-shaped extensions; depth of caudal peduncle 5.7–7.6% SL; body depth at anus 12.9–16.5% SL; head width 16.6–19.5% SL ........................................... G. granosus sp. nov.

– Anterior nuchal plate elements without lateral saddle-shaped extensions; depth of caudal peduncle 7.1–10.6% SL; body depth at anus 14.6–20.4%% SL; head width 19.3–22.9% SL ............................................. G. longinema