Mustura Celata, a New Genus and Species of Loaches from Northern Myanmar, and an Overview of Physoschistura and Related Taxa (Teleostei: Nemacheilidae)

Ichthyological Exploration of Freshwaters/IEF-1080/pp. 1-26 Published 2 August 2018 LSID: http://zoobank.org/urn:lsid:zoobank.org:pub:BEBD7270-0217-452F-B11B-99CA01744A3B DOI: http://doi.org/10.23788/IEF-1080

Mustura celata, a new genus and species of loaches from northern Myanmar, and an overview of Physoschistura and related taxa (Teleostei: Nemacheilidae)

Maurice Kottelat*

Mustura celata, new genus and species, is described from small tributaries of Lake Indawgyi, Myanmar. Mustura is distinguished from other genera of Nemacheilidae by having: the male pectoral fin slanted upwards, with branched ray 1 wider than following rays, branched once and branches close together, without membrane between them except near tip; wide, thickened unculiferous pad extending along anterior branched pectoral-fin rays, covered dorsally by small conical tubercles; two air bladder capsules connected by a manubrium and posterior chamber small and circular, or absent; lower lip with wide median interruption, two halves forming an acute angle, not in contact medially, wide and fleshy medially, forming a triangular ‘cushion’, partly free from jaw and connected to throat by a frenum; suborbital flap present, with small tubercles on posterior extremity. Most species earlier placed in Physoschistura in fact belong to Mustura. Physoschistura is diagnosed by having the two halves of the air bladder capsule joined medially (without manubrium) and the posterior chamber free, well developed and in direct contact with the capsule; it presently includes only P. brunneana (type species), P. pseudobrunneana, and possibly P. elongata, P. raoi and P. rivulicola. Mustura celata is distinguished from the other species of Mustura by, among others, the colour pattern (6-10 [usually 7] very irregular blotches or bars on flank, alternating with irregu- 1 lar saddles); 9 + 8 branched caudal-fin rays; 8 /2 branched dorsal-fin rays; lateral line complete; caudal peduncle depth 1.3-1.7 times in its length. Schistura shuensis, S. maepaiensis and S. bella belong to Mustura. Physoschistura absumbra belongs to Schistura s. l.; P. shuangjiangensis belongs to a distinct genus, apparently unnamed. Mustura, Pteronemacheilus, Physoschistura and Petruichthys seem to be closely related; they share features of the mouth morphology and unique features of the male pectoral fin and suborbital flap.

Introduction where about 260 species have been described; most are described and figured in Kottelat (1984, Nemacheilid loaches typically occur in fast flow- 1990, 1998, 2000, 2001) and Freyhof & Serov (2001). ing water of small streams and less often in other Besides, new species are still regularly described habitats such as large rivers and caves. The family (e. g. Bohlen & Šlechtová, 2010, Ou et al., 2011, has its greatest diversity in Southeast Asia from Plongsesthee et al., 2011, 2013), especially in

* Rue des Rauraques 6, 2800 Delémont, Switzerland (permanent address); and Lee Kong Chian Natural Histo- ry Museum, National University of Singapore, 2 Conservatory Drive, Singapore 117377. E-mail: [email protected]

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Received 6 February 2018 Revised 24 April 2018 Accepted 26 June 2018

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