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A Diminutive New Species of Glyptothorax (Siluriformes

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A Diminutive New Species of Glyptothorax (Siluriformes 375 Ichthyol. Explor. Freshwaters, Vol. 16, No. 4, pp. 375-383, 4 fi gs., December 2005 © 2005 by Verlag Dr. Friedrich Pfeil, München, Germany – ISSN 0936-9902 A diminutive new species of Glyptothorax (Siluriformes: Sisoridae) from the upper Irrawaddy River basin, Myanmar, with comments on sisorid and erethistid phylogenetic relationships Carl J. Ferraris, Jr.* and Ralf Britz** Glyptothorax panda, new species of the Asian catfi sh family Sisoridae, is described based on specimens from the upper Irrawaddy River basin, near Myitkyina, Myanmar. The species appears to be the smallest species of the genus Glyptothorax, and matures at 32 mm standard length or less. The species is distinguishable from congeners by a combination of meristic and color pattern characters. Several characters observed in this species resemble characters which have been hypothesized as derived states for some, or all, species of the family Erethistidae, which calls into question the validity of the current distinction between the Erethistidae and the Sisoridae. The new species exhibits a color pattern similar to that found in the syntopic species Akysis prashadi, which suggests the possibility of a mimetic relationship between the two species. Introduction nese species (Chu & Mo, 1999) cover a large percentage of the taxa. The sisorid catfi sh genus Glyptothorax is the most Until now, only fi ve species had been re- widely distributed genus of the family, extending ported from Myanmar, although this is in all longitudinally from Turkey to Fujian (China), and likelihood a substantial underestimate due, in from the south-draining Himalayan river basins part, to incomplete sampling of fi shes of that south to Java. Glyptothorax is also the most speci- country. Glyptothorax horai (Fowler, 1934) was ose genus of Asian catfi shes, with 84 nominal described from the Shan States; G. prashadi Muk- species attributable to Glyptothorax and at least erji, 1932, from the Mergui District; and G. cavia 60 species currently treated as valid (Eschmeyer (Hamilton, 1822) (or one of its synonyms), G. dor- et al., 1998; Ferraris, pers. obs.). No one has yet salis Vinciguerra, 1890, and G. trilineatus Blyth, attempted to revise the genus, although regional 1860, from a number of localities in the Irrawad- reviews of the southern Asian species (Menon, dy and Salween river basins. Several additional 1955, 1999; Misra, 1976; Jayaram, 1999) and Chi- species from the Irrawaddy River basin of China, * All Catfi sh Species Inventory, 2944 NE Couch St., Portland, Or, 97232, U.S.A. E-mail: [email protected] ** The Natural History Museum, Cromwell Road, SW7 5BD, UK. E-mail: [email protected] Ichthyol. Explor. 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