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Oreoglanis Pangenensis, a New Species of Torrent Catfish from Arunachal Pradesh, India (Siluriformes: Sisoridae)

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Oreoglanis Pangenensis, a New Species of Torrent Catfish from Arunachal Pradesh, India (Siluriformes: Sisoridae) 331 Ichthyol. Explor. Freshwaters, Vol. 25, No. 4, pp. 331-338, 6 figs., 1 tab., March 2015 © 2015 by Verlag Dr. Friedrich Pfeil, München, Germany – ISSN 0936-9902 Oreoglanis pangenensis, a new species of torrent catfish from Arunachal Pradesh, India (Siluriformes: Sisoridae) Bikramjit Sinha*, ** and Lakpa Tamang* Oreoglanis pangenensis, new species, is described from the Pange River, upper Brahmaputra River basin, Apatani plateau, Lower Subansiri District, Arunachal Pradesh, India. It belongs to the O. siamensis species group and is distinguished from all its congeners by a combination of two types of projections on the ventroposterior margin of the maxillary barbel: the proximal one-third with lobulate projections and the distal two-thirds with laciniate projec- tions. It is further distinguished from members of the O. delacouri group in having a median notch on the posterior margin of the lower lip, an entire lower lip margin, and (except for O. tenuicauda) an emarginate caudal fin. Introduction The glyptosternine genus Oreoglanis Smith, 1933 is characterized by having a continuous or Members of the sisorid subfamily Glyptosterninae uninterrupted postlabial groove on the lower jaw are catfishes living in torrential habitats with a and heterodont dentition (Chu et al., 1990): dorso-ventrally depressed head and body, and pointed teeth in the upper jaw, truncate to spatu- enlarged paired fins that aid in adhesion to the late teeth in the anterior region and pointed teeth substratum in fast-flowing mountain streams. in the posterior region of the lower jaw. Although They are found in the upper reaches of the Amu Oreoglanis has been demonstrated to be paraphy- Darya River drainage in Turkmenistan south- letic (He, 1995, 1996), we provisionally use the wards and eastwards to Indochina and the Yang- genus as understood by Ng & Kottelat (1999). tze River (Changjiang) drainage in central China, The genus Oreoglanis comprises twenty-two the Mekong and Salween drainages in northern species, which were previously divided into two and western Thailand, and in India (Vidthayanon species groups proposed by Ng & Rainboth (2001): et al., 2009; Linthoingambi & Vishwanath, 2011). the O. siamensis group and the O. delacouri group. The paraphyletic genera within the Glyptos- The former group consists of species with the terninae have largely been resolved by Zhou et lower lip notched medially and an entire or al. (2011) (e. g. with the splitting up of Pareuchilo- weakly laciniate posterior margin, as well as an glanis s. l.), though, some glyptosternine genera emarginate caudal fin; whereas the members of remain poorly diagnosed. the latter group have a lower lip with prominent * Zoological Survey of India, Arunachal Pradesh Regional Centre, Senki valley, Itanagar-791 113, Arunachal Pradesh, India. E-mail: [email protected]; [email protected] ** Corresponding author Ichthyol. Explor. Freshwaters, Vol. 25, No. 4 The whole contribution can be Dieser Beitrag kann als purchased as PDF fi le. PDF-Datei erworben werden. Availability Verfügbarkeit von PDF-Dateien Prinzipiell sind von allen unseren Publikationen PDF- Generally all our publications are available as PDF fi les; Dateien erhältlich. Komplette Publikationen in der Regel full publications as a general rule after the printed version erst nachdem die gedruckte Version vergriffen ist. An- is out of print. 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