Systematic revision of Pangasius polyuranodon (Siluriformes, Pangasiidae) with description of two new species

Pouyaud L., Gustiano R., Teugels G.G.

Date de parution: décembre 2002
Volume: 26
Number: 4
Pagination: 243-252
Editeur: Société Française d’Ichtyologie
doi: https://doi.org/10.26028/cybium/2002-264-001
Résumé

A detailed morphological study is performed on the widespread species Pangasius polyuranodon Bleeker, 1852 and reveals the existence of two new species. Pangasius mahakamensis sp. n. is described from the Mahakam River (East Kalimantan, Indonesia) while Pangasius elongatus sp. n. is described from Thailand and Vietnam. These new species which belong to the subgenus Pangasius (Pangasius) are morphologically close to P. polyuranodon. P. mahakamensis is recognised from the other species of this subgenus by the unique combination of the following characters: short caudal peduncle (14.0-16.7 %SL); large eye (diameter: 22.8-29.4 %HL); short mandibulary barbel (its length: 19.6-45.8 %HL); and short predorsal length (30.1-32.7 %SL). Pangasius elongatus is characterised by the unique combination of the following characters: an elongated body with a moderate predorsal length (30.1-33.9 %SL), a short snout length (35.2- 42.8 %HL), a long caudal peduncle (17.6-21.4 %SL), short mandibular barbels (length: 10.4-39.3 %HL) and large eyes (19.2-25.5 %HL). The results also show that Pangasius polyuranodon sensu stricto only consists of populations from Sumatra, Central and West Kalimantan (Indonesia) and Sarawak (Malaysia). A new diagnosis is given for this species.

Mots-clés: Indonesia - Morphology - New species - Pangasiidae - Pangasius elongatus - Pangasius mahakamensis - Taxonomy - Thailand - Vietnam
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