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Erethistoides Infuscatus, a New Species of Catfish (Teleostei: Erethistidae) from South Asia

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Erethistoides Infuscatus, a New Species of Catfish (Teleostei: Erethistidae) from South Asia 281 Ichthyol. Explor. Freshwaters, Vol. 17, No. 3, pp. 281-287, 4 figs., 1 tab., September 2006 © 2006 by Verlag Dr. Friedrich Pfeil, München, Germany – ISSN 0936-9902 Erethistoides infuscatus, a new species of catfish (Teleostei: Erethistidae) from South Asia Heok Hee Ng* Erethistoides infuscatus, new species, is described from the Brahmaputra and Meghna River drainages in northeast India and Bangladesh. Erethistoides infuscatus differs from congeners in having a brown body with a few indistinct pale patches sometimes present (vs. body with alternating brown and cream vertical bands) and the serrations on the anterior edge of the pectoral spine always distally directed (vs. serrations proximally directed on proximal half and distally directed on distal half of spine), 31-33 (vs. 27-31 vertebrae), and a less strongly produced snout with the premaxillary teeth only partially exposed when the mouth is closed. Introduction completely exposed when the mouth is closed (Ng, 2005). Additionally, Erethistoides species are The Erethistidae is a small group of sisoroid externally recognizable in having a depressed catfishes found primarily in lotic habitats through- head and divergent serrations on the anterior out South Asia (Indian subcontinent and Myan- edge of the pectoral spine. The genus, known mar). They are externally diagnosed by a combi- from the sub-Himalayan region of the Indian nation of tuberculate skin, prominent postcora- subcontinent, currently includes five species: coid processes, and serrations on the anterior edge E. montana Hora, 1950, E. pipri (Hora, 1950), of the pectoral spine. The alpha level diversity of E. sicula Ng, 2005, E. ascita Ng & Edds, 2005 and the group remains poorly known, with new spe- E. cavatura Ng & Edds, 2005. cies and genera being discovered in recent years During a series of collections in northeast (e.g. Ng & Kottelat, 2005; Ng, 2005). Members of India and Bangladesh, specimens of Erethistoides the genus Erethistoides are diagnosed by the neu- were obtained that were clearly unlike any previ- ral spines of the first eight post-Weberian verte- ously described species. The description of Erethis- brae strongly depressed, inflected posteriorly, toides infuscatus, new species, forms the basis of and positioned in a groove formed at the bases this study. The systematic position of the Erethis- of the neural spines of the vertebrae immedi- toides and the utility of the morphology of the ately posterior, an enlarged maxilla that is almost serrations on the anterior edge of the pectoral as long as the palatine, a fan-shaped mesethmoid spine in diagnosing erethistid genera are also lacking a distinct cornua and a strongly overhang- discussed. ing snout with the premaxillary tooth plates * Fish Division, Museum of Zoology, University of Michigan, 1109 Geddes Avenue, Ann Arbor, Michigan 48109-1079, U.S.A. E-mail: [email protected] Ichthyol. Explor. Freshwaters, Vol. 17, No. 3 The whole contribution can be Dieser Beitrag kann als purchased as PDF fi le. PDF-Datei erworben werden. 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