A new species of Metzia (Cypriniformes: Cyprinidae) from Northern Laos

Title
A new species of Metzia (Cypriniformes: Cyprinidae) from Northern Laos
Authors
Shibukawa, K; Phousavanh, P; Phongsa, K; Iwata, A
Keywords
Cypriniformes, Cyprinidae, Metzia bounthobi, new species, Laos
Issue Date
2012
Publisher
MAGNOLIA PRESS
Citation
ZOOTAXA 3586; 264-271
Abstract
A new cyprinid fish, Metzia bounthobi, is described on the basis of 18 specimens (including 10 specimens in type series) from the Mekong River basin in Phongsaly and Luang Prabang Provinces, northern Laos. The species is distinguished from congeners by having the following diagnostic traits: 18-20 branched anal-fin rays (vs. 10-18 in the others); 49-55 lateral-line scale rows (vs. 35-48); 33-36 predorsal scale rows (vs. 15-20); 20-22 circumpeduncular scale rows (vs. 14-18); 8-10 gill rakers on outer surface of first gill arch (vs. 12-18). The new species also resembles species of Hemiculterella, Ischikauia and at least some species of Anabarilius, in sharing a sharp keel developed only between the base of the pelvic fin and anus, soft last unbranched dorsal-fin ray, and air bladder composed of two chambers; however, M. bounthobi differs in having a considerably rounded snout (vs. pointed in Hemiculterella, Ischikauia and Anabarilius), 18-20 branched anal-fin rays (vs. 8-17 in Hemiculterella, Ischiakuia and Anabarilius), 49-55 lateral-line scale rows (vs. more than 58 in Ischikauia and Anabarilius, except for A. transmontana with 54-57), air bladder with rounded posterior end (vs. posterior end with a small lobe at least in Hemiculterella) and 39-40 vertebrae (vs. 40-43, 42-43 and 43-48 in Hemiculterella, Ischikauia and Anabarilius, respectively).
URI
http://hdl.handle.net/11267/2091
ISSN
1175-5326
Appears in Collections:
1.National University of Laos > Faculty of Biology > Journal articles
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