Teleostei: Sisoridae)

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Teleostei: Sisoridae) 323 Ichthyol. Explor. Freshwaters, Vol. 21, No. 4, pp. 323-330, 5 figs., 1 tab., December 2010 © 2010 by Verlag Dr. Friedrich Pfeil, München, Germany – ISSN 0936-9902 Two new species of Glyptothorax from the Koladyne basin, Mizoram, India (Teleostei: Sisoridae) Nongmaithem Anganthoibi* and Waikhom Vishwanath* Two new species of Glyptothorax are described from the Koladyne basin of Mizoram State, India. Glyptothorax ater is distinguished from its congeners by the combination of: rhomboidal thoracic adhesive apparatus with a con- spicuous central depression, longitudinally elongated and with a constriction at mid-length; ventral surface of pectoral spine and outer rays of pelvic fins pleated; and two horizontal creamish stripes against dark brown body. Glyptothorax caudimaculatus is distinguished by the combination of: unculiferous ridges of the thoracic adhesive apparatus extending anteriorly onto the gular region; sparsely granulated skin; light yellowish grey body and an oval blue black band at caudal-fin base. Introduction and Manipur states, India, and flows into the Bay of Bengal near Sittwe in Myanmar. The river is The sisorid catfish genus Glyptothorax includes separated from the Ganga-Brahmaputra drainage about 70 valid species distributed from Asia by the Chittagong hill tract in the west and from Minor (in the Tigris and Euphrates River drain- the Chindwin-Irrawaddy drainage by the Rakhine ages) westwards to East Asia (to the Yangtze River Yoma range in the east and is not connected to drainage) and southwards to the Sunda islands either, even in the floodplains. The ichthyofauna (Ferraris, 2007). These fishes typically inhabit fast of the Koladyne is poorly explored. Kar & Sen flowing hill streams or faster-flowing stretches of (2007) listed Glyptothorax cavia and G. telchitta larger rivers, and are distinctive in having a tho- from the river basin. A collection of fishes from racic adhesive apparatus, comprising of an el- the Koladyne at Kolchaw, Mizoram, included two liptical field of folded longitudinal pleats of skin, unnamed species of Glyptothorax which are de- a detached distal portion of the premaxilla with scribed here as G. ater and G. caudimaculatus. long and thin arms of the vomer that extend underneath the entire length of the articular proc- ess of the lateral ethmoid (de Pinna, 1996). Materials and methods Koladyne River, also called Chhimtuipui in Mizoram, India originates from the western face Measurements were made on the left side of of the Chin Hills in Myanmar, bordering Mizoram specimens with dial caliper to the nearest 0.1 mm, * Department of Life Sciences, Manipur University, Canchipur-795003, Manipur, India. 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