A review of the genus Pareuchiloglanis (Sisoridae) from the Lancangjiang (upper Mekong River) with descriptions of two new species from Yunnan, China

Abstract

This study reports five species of Pareuchiloglanis in the Lancangjiang drainage of China, including descriptions of two new species: P. abbreviatus sp. nov., P. gracilicaudata, P. kamengensis, P. myzostoma and P. prolixdorsalis sp. nov. The two new species are distinguished from P. feae, P. poilanei, P. sichuanensis and P. tianquanensis by a shorter adipose-fin base and the adipose-fin base being separated from the caudal fin, differ from P. sinensis, P. macrotrema, P. longicauda and P. rhabdurus by a more restricted gill opening (not reaching the base of the first pectoral-fin element ventrally), and differ from P. songmaensis by an anal-fin ray count of ii-3-4 (vs. ii-8). Pareuchiloglanis abbreviatus is distinguished from congeners by the tip of the dorsal fin reaching the origin of the adipose fin when depressed. Pareuchiloglanis prolixdorsalis is distinguished from P. gongshanensis, P. macropterus and P. kamengensis by lacking a sulcus between the lower lip and the base of the maxillary barbel, and differs from P. anteanalis by the shorter pectoral fin, the pectoral fin not reaching to the origin of pelvic fin. It differs from P. gracilicaudata, P. myzostoma, P. nebulifer and P. robusta by a caudal-fin ray count of 6+7 (vs. 7+8), and differs from P. abbreviatus by the tip of dorsal fin not reaching to the origin of the adipose fin when depressed (vs. reaching). It differs from P. songdaensis by the distance between the origin of the pelvic fin to the base of the anal fin being longer than that to the mouth (vs. equal).

Pareuchiloglanis hupingshanensis, a new species of the glyptosternine catfish (Siluriformes: Sisoridae) from the middle Yangtze River, China

“…Chu (1981) resurrected the genus Pareuchiloglanis Pellegrin, 1936, for species in the genus Euchiloglanis by inspecting the form of premaxillary tooth bands of the type species, E. davide. Both morphological and molecular phylogenetic analyses for the glyptosternoid fishes did not support the monophyly of Pareuchiloglanis (He 1995;Peng et al 2004;Guo et al 2005), and the twenty species can be divided into two groups according to external morphology (Li et al 2007). Recently, Zhou et al (2011) erected a new genus Creteuchiloglanis based on three species previously assigned to Pareuchiloglanis, and described two new species in this genus.…”

A New Genus of Glyptosternine Catfish (Siluriformes: Sisoridae) with Descriptions of Two New Species from Yunnan, China

“…Comparisons of type specimens of P. feae with specimens from Yunnan that were used in the studies of He (1995, 1996) and Li et al (2007) showed that P. feae is known only from Myanmar and is more closely related to species of Pareuchiloglanis than to the specimens from Yunnan. All records of P. feae from Yunnan are either misidentifications of P. macropterus or are based on an unnamed species related to P. gongshanensis, P. kamengensis, and P. macropterus.We propose a new genus for the three species of the second group of Li et al (2007), along with the unnamed species represented by the Yunnan populations previously identified as P. feae, and another previously identified as P. kamengensis from the Lancang-Jiang drainage (upper Mekong River), China. Those two new species are named herein, and diagnoses are provided for the other species of Creteuchiloglanis.…”

“…We propose a new genus for the three species of the second group of Li et al (2007), along with the unnamed species represented by the Yunnan populations previously identified as P. feae, and another previously identified as P. kamengensis from the Lancang-Jiang drainage (upper Mekong River), China. Those two new species are named herein, and diagnoses are provided for the other species of Creteuchiloglanis.…”

“…Thomson and Page (2006) recognized 18 species of Pareuchiloglanis and two more species were described by Li et al (2007). Nguyen (2005) described three additional species that were overlooked by Thomson and Page (2006) and Li et al (2007), and Yao et al (2007) placed Pareuchiloglanis macropterus Ng (2004) from the Nu-Jiang drainage (upper Salween River) and Irrawaddy River basin of China in the synonymy of P. kamengensis.A recent study of Pareuchiloglanis by Li et al (2007) divided the genus into two groups based on external morphology. One group included 16 species, including the type species, P. poilanei, and the second included four species: P. feae, P. gongshanensis, P. kamengensis, and P. macropterus.…”

“…A recent study of Pareuchiloglanis by Li et al (2007) divided the genus into two groups based on external morphology. One group included 16 species, including the type species, P. poilanei, and the second included four species: P. feae, P. gongshanensis, P. kamengensis, and P. macropterus.…”