Pareuchiloglanis kamengensis

Xu Li, Wei Zhou, Alfred W. Thomson, Qing Zhang & Ying Yang, 2007, A review of the genus Pareuchiloglanis (Sisoridae) from the Lancangjiang (upper Mekong River) with descriptions of two new species from Yunnan, China., Zootaxa 1440, pp. 1-19 : 12-13

Pareuchiloglanis kamengensis

(Fig. 6)

Euchiloglanis kamengensis Chu, 1979: 77 ( Lancangjiang drainage ); Wu et al, 1981: 77 (Lancangjiang drainage).

Pareuchiloglanis kamengensis : Chu, 1986: 41 (Lancangjiang drainage); Chu et al., 1990: 205 (Lancangjiang drainage); Wu & Wu, 1992: 552-554 (Lancangjiang drainage); Chen, 1998: 305-306 (Lancangjiang drainage); Chu & Mo 1999: 169 (Lancangjiang drainage).

Material examined. All examined specimens are from the upper Lancangjiang , Yunnan, China. SWFC 0411001-0411018 (18; 69.5-157.1 mm SL), Yingpan , Lanping County. SWFC 0409001-0409012 (12; 105.0- 155.6 mm SL), Yingpan , Lanping County. SWFC 0304001-0304002 (2; 154.5-177.4 mm SL), Tongdianhe , Lanping County.

Diagnosis. Characters distinguishing Pareuchiloglanis kamengensis from P. abbreviatus , P. gracilicaudata , P. myzostoma and P. prolixdorsalis are summarized in Table 1. Morphometric and meristic data are in Table 2. A species of Pareuchiloglanis with the following unique combination of characters: adipose-fin base not confluent with caudal fin (vs. confluent); premaxillary tooth patches appear separate (vs. joined with small median indention); lower lip not connected to base of maxillary barbel by skin flap, with sulcus between them (vs. connected, and without sulcus); 7 upper + 8 lower branched caudal-fin rays (vs. 6+7); dorsal fin i-5 (vs. i- 7); anal fin ii-3-4 (vs. ii-8); distance between pelvic-fin origin to anal-fin origin shorter than distance between pelvic-fin origin to mouth (vs. equal); pectoral fin extending beyond origin of pelvic fin (vs. not reaching); origin of pelvic fins opposite end of dorsal-fin base (vs. posterior to end of dorsal-fin base); anus nearer to anal-fin origin than to end of pelvic-fin base (vs. nearer to posterior end of pelvic-fin base); anal-fin origin nearer to caudal-fin base than to posterior end of pelvic-fin base (vs. nearer to end of pelvic-fin base).

Pareuchiloglanis kamengensis is distinguished from P. abbreviatus , P. anteanalis , P. gracilicaudata , P. myzostoma , P. nebulifer , P. robusta , P. macrotrema , P. prolixdorsalis , P. sinensis , P. sichuanensis , P. tianquanensis , P. rhabdurus , P. poilanei , P. longicauda and P. nebulifer by the following characters: two isolated premaxillary tooth patches (vs. premaxillary tooth patches appearing joined with a median indentation) (Fig. 2B); lower lip not connected to base of maxillary barbel by skin flap, with sulcus between them (vs. connected, without sulcus) (Fig. 3B). It differs from P. gracilicaudata , P. gongshanensis , P. longicauda , P. macrotrema , P. myzostoma , P. robusta and P. sinensis by having longer pectoral fin, extending beyond origin of pelvic fin (vs. not reaching). It differs from P. feae , P. poilanei , P. sichuanensis and P. tianquanensis by adipose-fin base not confluent with caudal fin (vs. confluent). It differs from P. abbreviatus and P. prolixdorsalis by having 7+8 branched caudal-fin rays (vs. 6+7). It differs from P. songmaensis by having fewer fin rays, dorsal fin i-5, anal fin ii-3-4 (vs. i-7, ii-8). It differs from P. longicauda and P. sinensis by having origin of pelvic fin opposite end of dorsal-fin base (vs. posterior to end of dorsal-fin base), and differs from P. songdaensis by having distance between pelvic-fin origin to anal-fin origin shorter than distance between pelvic-fin origin to mouth (vs. equal). It differs from P. abbreviatus , P. anteanalis , P. feae , P. longicauda , P. nebulifer , P. prolixdorsalis and P. rhabdurus by having anus nearer to anal-fin origin (vs. nearer to posterior end of pelvic-fin base) and differs from P. rhabdurus by its deeper caudal peduncle, 6.5-8.9% SL (vs. 4.2% SL).

Distribution. Known from the upper Lancangjiang [Mekong] and Brahmaputra drainages (Fig. 4).

Remarks. Ng (2004) postulated that P. kamengensis recorded in the Lancangjiang by Chu & Mo (1999) could be P. macropterus Ng , and that P. kamengensis is distributed only in Brahmaputra. However, the specimens of Pareuchiloglanis from the Lancangjiang are distinguished from P. macropterus by having a pectoral fin that reaches the origin of the pelvic fin (vs. not reaching), and no pale patches on the body (vs. presence). Based on the taxonomic study results of Chu & Mo (1999), specimens of Pareuchiloglanis from Lancangjiang are most similar to those of P. kamengensis . In the absence of sufficient evidence, the authors provisionally identify these specimens as P. kamengensis .