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Ichthyological Exploration of Freshwaters an International Journal for fi Eld-Orientated Ichthyology

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Ichthyological Exploration of Freshwaters an International Journal for fi Eld-Orientated Ichthyology Verlag Dr. Friedrich Pfeil ISSN 0936-9902 Ichthyological Exploration of Freshwaters An international journal for fi eld-orientated ichthyology Volume 20 Number 3 Ichthyological Exploration of Freshwaters An international journal for fi eld-orientated ichthyology Volume 20 • Number 3 • Sptember 2009 pages 193-288, 60 fi gs., 16 tabs. Managing Editor Maurice Kottelat, Route de la Baroche 12, Case postale 57 CH–2952 Cornol, Switzerland Tel. + 41 - 32 - 4 62 31 75 / Fax + 41 - 32 - 4 62 22 59 / E-mail [email protected] Editorial board Pier Giorgio Bianco, Dipartimento di Zoologia, Università, Napoli, Italy Ralf Britz, Department of Zoology, The Natural History Museum, London, United Kingdom Sven O. Kullander, Naturhistoriska Riksmuseet, Stockholm, Sweden Helen K. Larson, Museum and Art Gallery of the Northern Territory, Darwin, Australia Lukas Rüber, Department of Zoology, The Natural History Museum, London, United Kingdom Ivan Sazima, Museu de Zoologia, Unicamp, Campinas, Brazil Paul H. Skelton, South African Institute for Aquatic Biodiversity, Grahamstown, South Africa Heok Hui Tan, Raffl es Museum of Biodiversity Research, National University of Singapore, Singapore Ichthyological Exploration of Freshwaters is published quarterly Subscriptions should be addressed to the Publisher: Verlag Dr. Friedrich Pfeil, Wolfratshauser Str. 27, D–81379 München, Germany PERSONAL SUBSCRIPTION : EURO 100 per Year/volume - 4 issues (includes surface mail shipping) INSTITUTIONAL SUBSCRIPTION : EURO 180 per Year/volume - 4 issues (includes surface mail shipping) Manuscripts should be addressed to the Managing Editor: Maurice Kottelat, Route de la Baroche 12, Case postale 57, CH –2952 Cornol, Switzerland CIP-Titelaufnahme der Deutschen Bibliothek Ichthyological exploration of freshwaters : an international journal for fi eld-orientated ichthyology. – München : Pfeil. Erscheint jährl. viermal. – Aufnahme nach Vol. 1, No. 1 (1990) ISSN 0936-9902 Vol. 1, No. 1 (1990) – Copyright © 2009 by Verlag Dr. Friedrich Pfeil, München, Germany All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying or otherwise, without the prior permission of the copyright owner. Applications for such permission, with a statement of the purpose and extent of the reproduction, should be addressed to the Publisher, Verlag Dr. Friedrich Pfeil, Wolfratshauser Str. 27, D-81379 München, Germany. Printed by Advantage Printpool, Gilching ISSN 0936-9902 Printed in the European Union Verlag Dr. Friedrich Pfeil, Wolfratshauser Str. 27, D-81379 München, Germany Tel. + 49 - (0)89 - 74 28 27 0 – Fax + 49 - (0)89 - 72 42 77 2 – E-mail: [email protected] – www.pfeil-verlag.de 223 Ichthyol. Explor. Freshwaters, Vol. 20, No. 3, pp. 223-228, 4 figs., 1 tab., September 2009 © 2009 by Verlag Dr. Friedrich Pfeil, München, Germany – ISSN 0936-9902 Danio tinwini, a new species of spotted danio from northern Myanmar (Teleostei: Cyprinidae) Sven O. Kullander* and Fang Fang* Danio tinwini, new species, is described from the upper course of the Mogaung Chaung, a right bank tributary of the Ayeyarwaddy River. It is distinguished from other species of Danio above all by the colour pattern, comprised of rows of dark spots along the side, and spotted dorsal, anal, pelvic, and caudal fins. From D. kyathit, with similar colour pattern, it is distinguished by the absence of lateral line and rostral barbel. From D. nigrofasciatus, which it resembles in small size, absence of lateral line and rostral barbel, and lateral stripe P-1 expressed as a row of spots, it is distinguished by the dorsal-fin count ii.6 { (vs. ii.7 {), and stripes P and P+1 expressed as rows of spots instead of as solid stripes. Danio tinwini is one of the smallest species of Danio, males reaching up to 21.7 mm SL, females up to 25.6 mm SL. Introduction striped pattern has also been reported for this species (Fang, 1997; Kullander et al., 2009). An- The cyprinid fish genus Danio includes 15 small other spotted species, similar to D. kyathit in species in South and South East Asia (Fang Kul- colour pattern, but of much smaller size, has re- lander, 2001; Kullander & Fang, 2009; Kullander cently been imported as aquarium fish from et al., 2009). Nine valid species have been re- Myanmar and is marketed as Danio sp. “Burma”. ported from Myanmar, including Danio aesculapii, Through the courtesy of Tin Win, Hein Aquarium, D. albolineatus, D. choprae, D. erythromicron, D. fee- in Yangon, we have obtained a good series of gradei, D. kyathit, D. margaritatus, D. nigrofasciatus, wild specimens of this species, and the present and D. quagga (Kullander & Fang, 2009; Kul- paper is dedicated to its formal description. lander et al., 2009). Species of Danio have species specific colour patterns, usually in the form of horizontal stripes, Material and methods more rarely light or dark spots, or vertical bars. Danio kyathit, from near Myitkyina on the Aye- Specimens are kept in the fish collection of the yarwaddy River in northern Myanmar is remark- Swedish Museum of Natural History, Stockholm able for its distinctive contrasting colour pattern (NRM), and the Museum of Zoology, University of dark spots on yellowish ground, although a of Michigan, Ann Arbor (UMMZ). Measurements * Department of Vertebrate Zoology, Swedish Museum of Natural History, PO Box 50007, SE-104 05 Stockholm, Sweden. E-mail: [email protected], [email protected] Ichthyol. Explor. Freshwaters, Vol. 20, No. 3 224 were taken with digital callipers to a precision of Diagnosis. A small-sized Danio distinguished by 0.1 mm. Counts and measurements were made unique colour pattern consisting of three irregu- according to Fang (1997), and colour pattern lar rows of dark spots along the side, and spotted terminology follows Fang (1998). Horizontal instead of striped or unmarked pelvic (in males), stripes are identified by alphanumeric annota- dorsal, anal, and caudal fins. Distinguished also tions: the P stripe is the dark stripe along the from all other species of Danio except D. aesculapii middle of the side, those above are numbered by 6 { vs. 7 { or more unbranched dorsal-fin rays, P+1, P+2, those below P-1, P-2, P-3; stripes on the and from all except D. nigrofasciatus, D. margari- anal fin are numbered with the middle one the tatus, and D. erythromicron by the combined ab- A stripe, the proximal stripe A+1, and the distal sence of rostral barbel and pored lateral line scales. stripe A-1. Fin-ray counts from median fins and vertebral counts were obtained from X-radio- Description. Measurements and counts were graphs made with a Philips MG-105 low voltage taken from five males and five females, 20.0- X-ray unit and Kodak X-Omat V plates. Ab- 24.0 mm SL (Table 1). General body features and dominal vertebrae counts include the Weberian pigmentation are illustrated in Figures 1-3. apparatus (assumed to contain four centra). Sta- Body compressed, males elongate (body depth tistics were calculated using SPSS v. 17 (SPSS, 23.0-26.4 % SL), females with deep and wide 2008). abdomen (body depth 27.3-30.3 % SL). Head compressed, slightly deeper than wide. Snout Comparative material. Danio albolineatus NRM 37308; short, obtuse, shorter than eye diameter. Mouth D. choprae NRM 52001; D. dangila NRM 51441; D. erythro- terminal, directed almost vertically. Small bony micron NRM 51629; D. feegradei NRM 55111; D. kerri knob at dentary symphysis. Maxilla not reaching NRM 36414; D. kyathit NRM 50496; D. margaritatus NRM to below anterior margin of orbit; premaxillary 55113; D. meghalayensis UMMZ 243666; D. nigrofasciatus, NRM 51630; D. rerio, NRM 40446; D. roseus NRM 44799; ascending processes not reaching to vertical from and material of D. aesculapii, D. kyathit, and D. quagga anterior margin of orbit. Lower jaw projecting already listed in Fang (1998), Kullander & Fang (2009), beyond upper jaw, ending anteriorly above and Kullander et al. (2009). horizontal through upper ‚ of eye. Lower jaw with anterior fleshy lateral lobe; tubercles absent from lateral lobe except occasionally present in Danio tinwini, new species males, with 2-3 lateral pointed tubercles combined (Fig. 1) with up to five tubercles in single row along lateral margin of dentary. Rostral barbel absent, Holotype. NRM 60337, adult male, 21.7 mm SL; except a minute projection in 22.9 mm female Myanmar: Kachin State: Ayeyarwaddy River (NRM 56838) with unusually long maxillary drainage: stream from Shatrazyut (Sha Du Zup) barbel. Maxillary barbel variably developed, village, on the road from Mogaung to Tanai, shortest ending slightly posterior to orbit, longest 25°54'54"N 96°39'48"E; Tin Win & Aung Myint, at middle of opercle. 20 Feb 2003. Lateral line absent; 28-29 scales in a row rep- resenting expected lateral line course. Scales in a Paratypes. NRM 56838, 39 males, 20.0-21.4 mm row along middle of side 26 (3), 27 (5), 28 (2). SL, 24 females, 20.9-25.6 mm SL; same data as Median predorsal scales 15 (9), 16 (1). Body lat- holotype. eral scale rows 6 (6), 7 (4). Circumpeduncular scale rows 10 (10). A row of scales along anal-fin Non-types. NRM 49487, 26 males, 16.2-19.4 mm SL, 15 base. females, 20.3-25.5 mm SL; NRM 49488, 17, tissue sam- Dorsal-fin rays ii.6 { (10); anal-fin rays ples, not measured; NRM 49489, 6, tissue samples, not iii.9 { (1), iii.10 { (5), iii.11 { (4); pectoral-fin rays measured; Myanmar: locality uncertain: kept in aquar- i.10 (3), i.11 (7); pelvic-fin rays i.6 (8), i.7 (1); prin- ium. 2002-2003; Aung Myint & Zaw Oo, 2002-2003. – NRM 50837. 1, tissue sample, not measured; NRM 50838, cipal caudal-fin rays 10+9 (10). Dorsal fin inserted 1, tissue sample, not measured; 50840, 3 males, 20.5-23.9, at highest point of dorsum, at about … distance 1 female, 23.4 mm SL; aquarium import; S.
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