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Eight New Species of the Torrent Catfish Genus Oreoglanis (Teleostei: Sisoridae) from Thailand

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Eight New Species of the Torrent Catfish Genus Oreoglanis (Teleostei: Sisoridae) from Thailand 127 Ichthyol. Explor. Freshwaters, Vol. 20, No. 2, pp. 127-156, 16 figs., 8 tabs., June 2009 © 2009 by Verlag Dr. Friedrich Pfeil, München, Germany – ISSN 0936-9902 Eight new species of the torrent catfish genus Oreoglanis (Teleostei: Sisoridae) from Thailand Chavalit Vidthayanon*, Pasakorn Saenjundaeng** and Heok Hee Ng*** We describe eight new species of the sisorid catfish genus Oreoglanis from the Chao Phraya, Mekong and Salween river drainages in northern and western Thailand. The new species are diagnosed by a combination of morphol- ogy of maxillary-barbel tip, lower-lip morphology, extent of pectoral fin, fusion of the adipose fin with the upper procurrent caudal-fin rays, caudal-fin morphology, and the relative proportions of the head, snout, nasal barbel, interorbital distance, eye, body depth at anus, adipose fin, caudal peduncle and post-adipose distance. The tax- onomy of O. pumatensis, a poorly known species from Vietnam is also discussed; it is considered a junior subjec- tive synonym of O. infulatus here. Introduction 2005), the phylogenetic relationships within the Glyptosterninae remain poorly studied (in part Glyptosternines are sisorid catfishes found in caused by difficulty in acquiring material from torrential streams and rivers from the upper throughout its entire range); the monophyly of reaches of the Amu Darya River drainage in many glyptosternine genera remain untested. Turkmenistan south- and eastwards to the river The glyptosternine genus Oreoglanis Smith, drainages of Indochina and the Yangtze (Chang- 1933, has been traditionally defined by a con- jiang) River drainage in central China. They are tinuous postlabial groove on the lower jaw and easily distinguished from other catfishes by their heterodont dentition (e.g. Chu et al., 1990). How- strongly depressed head and body, and greatly ever, He (1995, 1996) demonstrated the para- enlarged paired fins that have been modified to phyly of Oreoglanis with Pareuchiloglanis and form an adhesive apparatus. Although the mono- Pseudexostoma (possibly including Myersglanis and phyly of the Glyptosterninae has been corrobo- Parachiloglanis as well), and there is a clear need rated (de Pinna, 1996; Peng et al., 2004; Guo et al., to rediagnose glyptosternine genera. Until such * Petrified Wood and Mineral Resources Research Institute, Nakorn Ratchsasima Rajabhat University, 184 Suranaree, Amphoe Mueong, Nakorn Ratchsasima Province 30000, Thailand. E-mail: [email protected], [email protected] ** Khonkaen University, Nongkhai Campus 112/7 Amphoe Mueong, Nongkhai Province 43000, Thailand: E-mail: [email protected] *** Raffles Museum of Biodiversity Research, Department of Biological Sciences, National University of Singa- pore, 6 Science Drive 2, #03-01, Singapore 117546. 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