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Gogangra Laevis, a New Species of Riverine Catfish from Bangladesh

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279 Ichthyol. Explor. Freshwaters, Vol. 16, No. 3, pp. 279-286, 8 fi gs., 1 tab., September 2005 © 2005 by Verlag Dr. Friedrich Pfeil, München, Germany – ISSN 0936-9902 Gogangra laevis, a new species of riverine catfi sh from Bangladesh (Teleostei: Sisoridae) Heok Hee Ng* Gogangra laevis, new species, is described from the Brahmaputra River drainage in Bangladesh. It differs from its sole congener, G. viridescens, in having a gently curved (vs. distinctly notched) anteroventral margin of the oper- cle, narrower head (17.2-20.8 % SL vs. 19.7-23.2; 58.2-64.8 % HL vs. 65.6-76.9) and larger eye (20.3-24.8 % HL vs. 16.2-20.5). Introduction phylogenetic study of the Sisoridae, distinct dif- ferences were noted between the material from Gogangra Roberts, 2001 is a monotypic genus of the lower Ganges-Brahmaputra system in Bang- sisorid catfi sh known from the Ganges and Brah- ladesh and material further upriver. These differ- maputra River drainages in India, Nepal and ences suggested that the material from Bangla- Bangladesh. The sole species, G. viridescens (Ham- desh belongs to a second, undescribed species, ilton, 1822), was previously considered a species which is described in this study as G. laevis. of Nangra Day (1877), but can be distinguished from Nangra in having a Y-shaped mesethmoid that is not greatly expanded (vs. fan-shaped me- Material and methods sethmoid that is greatly expanded), an edentulous palate (vs. palate with teeth) and the maxillary Measurements were made point to point with barbel without a conspicuous membrane poste- dial calipers and data recorded to a tenth of a riorly (Roberts & Ferraris, 1998). The genus was millimeter. Counts and measurements were made given the name Gangra by Roberts & Ferraris on the left side of specimens whenever possible, (1998), but as pointed out by Roberts (2001), the following Ng & Lim (1995), except for the follow- name is a primary junior homonym of Gangra ing: head length was measured from the tip of Walker, 1862 (Lepidoptera), who proposed Gogan- the snout to the posteriormost extremity of the gra as a replacement name. fl eshy opercular fl ap, and vertebral counts which While comparing material identifi ed as G. viri- are expressed as abdominal+postabdominal ver- descens from the Ganges and Brahmaputra River tebrae (where postabdominal vertebrae are those drainages in India, Nepal and Bangladesh for a with closed hemal arches). The following meas- * Fish Division, Museum of Zoology, University of Michigan, 1109 Geddes Avenue, Ann Arbor, Michigan 48109-1079, USA. E-mail: [email protected] Ichthyol. Explor. 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