Pareuchiloglanis gracilicaudata (Wu & Chen)

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: 8-12

publication ID

z01440p001

persistent identifier

http://treatment.plazi.org/id/C6313F06-0734-CB00-9868-2861AFD7CFE7

treatment provided by

Thomas

scientific name

Pareuchiloglanis gracilicaudata (Wu & Chen)
status

 

Pareuchiloglanis gracilicaudata (Wu & Chen) 

(Fig. 5)

Euchiloglanis gracilicaudata Wu & Chen, 1979  ZBK  : 294-296 ( Nangqian, Qinghai  ); Wu et al, 1981: 77.

Pareuchiloglanis gracilicaudata  : Chu, 1981: 27; Chu, 1986: 41. Chu et al., 1990: 205 (Deqin and Weixi, Yunnan); Wu & Wu, 1992: 551-552; Chen, 1998: 309-310; Chu & Mo 1999: 169 (Nangqian, Qinghai; Deqin, Yunnan).

Material examined. All examined specimens are from the upper Lancangjiang , Yunnan, China. SWFC 9910098 (1; 166 mm SL), Yingpan , Lanping County.  SWFC 0004088-0004092 (5; 96-98 mm SL), Foshan , Deqin County.  SWFC 0004051-0004059 (9; 91-125 mm SL), Kangpu , Weixi County.  SWFC 0004065- 0004077 (13; 84-116 mm SL), Yanwa , Weixi County. 

Diagnosis. Characters distinguishing Pareuchiloglanis gracilicaudata  from P. abbreviatus  , P. kamengensis  , P. myzostoma  and P. prolixdorsalis  are summarized in Table 1. Morphometric and meristic data are in Table 3. A species of Pareuchiloglanis  ZBK  with the following unique combination of characters: adipose-fin base not confluent with caudal fin (vs. confluent); premaxillary tooth patches appear joined (vs. separate); lower lip connected to base of maxillary barbel by skin flap, without sulcus between them (vs. not connected, with sulcus); branched caudal-fin rays 7 upper + 8 lower (vs. 6+7); dorsal fin i-5-6 (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 not reaching pelvic-fin origin (vs. reaching or extending beyond); pelvic fin reaching anus (vs. not reaching); origin of pelvic fin opposite end of dorsal-fin base (vs. posterior to end of dorsal-fin base); anus midway between anal-fin origin and posterior end of pelvic-fin base (vs. nearer to posterior end of pelvic-fin base or nearer to anal-fin origin); anal-fin origin midway between posterior end of pelvic-fin base and caudal-fin base (vs. nearer to posterior end of pelvic-fin base or caudal-fin base); snout length 58.3- 81.3% HL; caudal peduncle depth 3.5-6.0% SL.

Pareuchiloglanis gracilicaudata  is distinguished from P. gongshanensis  ZBK  , P. feae  , P. kamengensis  and P. macropterus  ZBK  by a combination of the following characters: premaxillary tooth patches appear joined with median indentation (vs. separate) (Fig. 2A); lower lip connected to base of maxillary barbel by skin flap, and without sulcus between them (vs. not connected, with sulcus) (Fig. 3A). It differs from P. abbreviatus  and P. anteanalis  ZBK  by its shorter pectoral fin, pectoral fin not reaching origin of pelvic fin (vs. reaching), and differs from P. feae  , P. poilanei  ZBK  , P. sichuanensis  ZBK  and P. tianquanensis  by its adipose-fin base not being confluent with caudal fin (vs. confluent). Pareuchiloglanis gracilcaudata  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 fins opposite end of dorsal-fin base (vs. posterior to end of dorsal-fin base). It differs from P. abbreviatus  , P. anteanalis  ZBK  , P. feae  , P. longicauda  , P. nebulifer  ZBK  and P. rhabdurus  ZBK  by having origin of anus midway between posterior end of pelvic-fin base and anal-fin origin (vs. nearer to anal-fin origin or posterior end of pelvic-fin base). It differs from P. kamengensis  , P. macrotrema  , P. nebulifer  ZBK  , P. rhabdurus  ZBK  and P. robusta  ZBK  by having origin of anal fin midway between posterior end of pelvic-fin base and caudal-fin base (vs. nearer posterior of pelvicfin base or caudal-fin base). It differs from P. myzostoma  by pelvic fin reaching anus (vs. not reaching) and longer snout, 58.3-81.3% HL (vs. 47.2-51.8% SL). Pareuchiloglanis gracilicaudata  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) and more slender caudal peduncle.

Distribution. Known only from the upper Lancangjiang [Mekong] drainage (Fig. 4).