Taxonomic revision of the Southeast Asian brook barb genus Poropuntius Smith, 1931 (Teleostei, Cyprinidae) with description of a new species from Vietnam Author Hoang, Huy Duc 0000-0001-6528-193X Department of Ecology and Evolutionary Biology, University of Science, Ho Chi Minh City, Vietnam & Vietnam National University, Ho Chi Minh City, Vietnam Author Pham, Hung Manh 0000-0003-3186-818X Department of Ecology and Evolutionary Biology, University of Science, Ho Chi Minh City, Vietnam & Vietnam National University, Ho Chi Minh City, Vietnam Author Tran, Ngan Trong 0000-0001-7254-2835 Department of Ecology and Evolutionary Biology, University of Science, Ho Chi Minh City, Vietnam & Vietnam National University, Ho Chi Minh City, Vietnam Author Durand, Jean-Dominique 0000-0002-0261-0377 IRD, MARBEC (University of Montpellier, CNRS, Ifremer, IRD), Montpellier, France Author Wu, Ling https://orcid.org/0009-0001-5700-1616 Southeast Asia Wildlife Biodiversity Research Group, Kunming Institute of Zoology, the Chinese Academy of Sciences, Kunming, Yunnan 650223, China & Southeast Asia Biodiversity Research Institute, Chinese Academy of Science, Yezin, Nay Pyi Taw 05282, Myanmar Author Pfeiffer, John 0000-0001-5368-0589 Department of Invertebrate Zoology, National Museum of Natural History, Smithsonian Institution, 10 th and Constitution Avenue NW, Washington, DC 20560, USA Author Chen, Xiao-Yong 0000-0002-0924-5560 Southeast Asia Wildlife Biodiversity Research Group, Kunming Institute of Zoology, the Chinese Academy of Sciences, Kunming, Yunnan 650223, China & Southeast Asia Biodiversity Research Institute, Chinese Academy of Science, Yezin, Nay Pyi Taw 05282, Myanmar Author Page, Lawrence M. 0000-0002-8823-0729 Florida Museum of Natural History, University of Florida, 1659 Museum Road, Gainesville, FL 32611, USA text ZooKeys 2024 2024-06-06 1204 199 222 journal article 298187 10.3897/zookeys.1204.120873 57bd1d90-6de1-40c8-98a7-acac50ba37d2 34FB4522-549E-48D1-9E88-B9165112E9CC Poropuntius laoensis (Günther, 1868) Barbus laoensis Günther , 1868: 115 . Type locality: Laos Moutains, Cochinchina . Holotype : BMNH 1862.7. 28.15 . Poropuntius bantamensis ( Rendahl, 1920 ) : 1, fig. 1. Type locality: Thailand , Ban Tam , east of Doi Chieng Dao , pond fed by a subterranean stream. Holotype : NRM 10969 . Poropuntius aluoiensis ( Nguyen, 1997 ) : 1, fig. 1. Type locality: Vietnam , Thua Thien Hue Province , A Luoi District , A Sap stream at Nham , Sekong basin , 16 ° 15 ' 32 " N , 107 ° 13 ' 31 " E . Holotype : HNUE V 1.1. 21 . Notes. Our seven specimens of P. laoensis specimens (Fig. 3 D, E ) were collected in the upper Xekong drainage of Central Vietnam , the type locality, i. e., in the Lao Mountains of Cochin-China, now Central Vietnam . Topotypic material of P. bantamensis and P. aluoiensis resembled P. laoensis in having the proximal half of the caudal fin orange and the distal half bright yellow, and bold black submarginal stripes on the caudal fin. Distribution. Poropuntius laoensis occurs in the Lower Salween, Chao Phraya, Lower Lancang, northern Annam , and Kratie-Stung Treng ecoregions.