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Akysis Vespertinus, a New Species of Catfish from Myanmar (Siluriformes: Akysidae)

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Akysis Vespertinus, a New Species of Catfish from Myanmar (Siluriformes: Akysidae) 255 Ichthyol. Explor. Freshwaters, Vol. 19, No. 3, pp. 255-262, 5 figs., 1 tabs., September 2008 © 2008 by Verlag Dr. Friedrich Pfeil, München, Germany – ISSN 0936-9902 Akysis vespertinus, a new species of catfish from Myanmar (Siluriformes: Akysidae) Heok Hee Ng* Akysis vespertinus, new species, is described from the Ann Chaung drainage in western Myanmar. It is distinguished from congeners in having a unique combination of the following characters: narrow snout, causing head to appear acutely triangular; length of pectoral spine 17.1-22.2 % SL; length of adipose-fin base 18.8-21.1 % SL; body depth at anus 13.5-16.0 % SL; depth of caudal peduncle 7.4-9.2 % SL; length of caudal peduncle 19.0-22.8 % SL; head length 27.1-30.2 % SL; interorbital distance 24.5-28.8 % HL; length of nasal barbel 37.8-48.3 % HL; length of max- illary barbel 84.9-96.6 % HL; smooth posterior edge of pectoral spine; forked caudal fin; presence of two light saddle-shaped patches on upper surface of postdorsal region; absence of brown coloration on abdomen. Introduction Recently, specimens of Akysis collected from the Ann Chaung drainage (a river draining the Members of the sisoroid genus Akysis are small western face of the Rakhine Yoma) in western catfishes with tuberculate skin and a color pattern Myanmar were made available to me via the generally consisting of yellow patches or bands aquarium trade. Comparison with the five de- on a brown body. They are diagnosed by the scribed Akysis species from Myanmar and other anterior margin of the pectoral spine with a notch congeners revealed enough differences to warrant visible dorsally and the nasals with expansions its recognition as an undescribed species. The beyond the canal-bearing region (de Pinna, 1996), description of this new species as Akysis vesperti- and generally inhabit fast-flowing streams and nus forms the basis of this study. rivers in the area of Southeast Asia bordered by the Irrawaddy River drainage to the west, the rivers draining the eastern face of the Annam Material and methods Cordilleras in central Vietnam to the east, the Lancangjiang (upper Mekong) drainage to the Measurements were made point-to-point with north and the Citarum River drainage on Java to dial calipers and recorded to 0.1 mm. Ng & Kot- the south. Most of the current recognized diver- telat (1998) are followed for all measurements sity within Akysis is recent, with more than half and counts, with the following additions: dorsal- of the 18 valid species being described within the spine length, which is measured from the base to last decade (Ng & Kottelat, 1998; Ferraris, 2007; the tip of the dorsal spine, and head depth, which Page et al., 2007). is measured at the base of the supraoccipital proc- * Raffles Museum of Biodiversity Research, Department of Biological Sciences, National University of Singa- pore, 6 Science Drive 2, Singapore 117546. E-mail: [email protected] Ichthyol. Explor. Freshwaters, Vol. 19, No. 3 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. 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