Zootaxa 4341 (2): 151–192 ISSN 1175-5326 (print edition) http://www.mapress.com/j/zt/ Article ZOOTAXA Copyright © 2017 Magnolia Press ISSN 1175-5334 (online edition) https://doi.org/10.11646/zootaxa.4341.2.1 http://zoobank.org/urn:lsid:zoobank.org:pub:4070D499-15BE-4ED0-8FC6-7A52E070D053 Revision of the horseface loaches (Cobitidae, Acantopsis), with descriptions of three new species from Southeast Asia DAVID A. BOYD1,8, PATCHARA NITHIROJPAKDEE2, GRIDSADA DEEIN3, CHAVALIT VIDTHAYANON4, CHAIWUT GRUDPAN5, WEERAPONGSE TANGJITJAROEN6, JOHN M. PFEIFFER1, ZACHARY S. RANDALL1, TIPPAMAS SRISOMBAT7 & LAWRENCE M. PAGE1,8 1Florida Museum of Natural History, University of Florida, Gainesville, Florida, 32611, USA. 2Faculty of Agro-Industrial Technology, Rajamangala University of Technology, Tawan-Ok Chanthaburi Campus, Chanthaburi Thailand 3Suphan Buri Inland Fisheries Research and Development Center, Mueang District, Suphan Buri 72000 Thailand 4Independent Researcher, Bangkok, Thailand 5Department of Fisheries, Faculty of Agriculture, Ubonrajathanee University, Thailand 6Faculty of Veterinary Medicine, Chiang Mai University, Chiang Mai 50100 Thailand 7Inland Fisheries Research and Development Division, Department of Fisheries, Kasetklang, Chatuchak, Bangkok 10900 Thailand 8Corresponding author. E-mail:
[email protected], L.M. Page:
[email protected] Abstract Acantopsis (Cobitidae) is revised based on analysis of morphological and molecular data. Four of the six available names, A. dialuzona, A. spectabilis, A. octoactinotos, and A. thiemmedhi, are valid, and three new species, A. rungthipae, A. dine- ma, and A. ioa, are described. All species are described morphologically, distributions are mapped, and relationships are discussed for those for which molecular data (CO1, RAG1) are available. Labial barbels, color pattern, and meristic counts are the most diagnostic features.