Revision of the horseface loaches (Cobitidae, Acantopsis), with descriptions of three new species from Southeast Asia Author Boyd, David A. Author Nithirojpakdee, Patchara Author Deein, Gridsada Author Vidthayanon, Chavalit Author Grudpan, Chaiwut Author Tangjitjaroen, Weerapongse Author Pfeiffer, John M. Author Randall, Zachary S. Author Srisombat, Tippamas Author Page, Lawrence M. text Zootaxa 2017 2017-10-31 4341 2 151 192 journal article 31691 10.11646/zootaxa.4341.2.1 e1cd4661-3d65-4dce-bdbc-757b73e88fde 1175-5326 1039411 4070D499-15BE-4ED0-8FC6-7A52E070D053 Key to the identification of species of Acantopsis 1 Conspicuous dark spots, blotches, or bands on caudal fin...................................................... 2 - No conspicuous dark spots, blotches, or bands on caudal fin.................................................... 3 2 Large black blotch on tip of anterior rays of dorsal fin; large black blotch on tip of each lobe of caudal fin, smaller black spots or bands in middle of caudal fin; 1 pair of labial barbels............................................ A. thiemmedhi - No large black blotch on tip of anterior rays of dorsal fin; 2–3 black, irregular bands or blotches on caudal fin, darkest at extremity of lower lobe; 2–3 pairs of labial barbels................................................. A. spectabilis 3 Well developed ocellus on upper margin of caudal-fin base; 3 pairs of labial barbels........................ A. dialuzona - No ocellus on upper margin of caudal-fin base (small black spot may be present); 0–2 pairs of labial barbels............. 4 4 Row of black specks beneath midlateral row of black spots from opercle to pelvic fin......................... A. dinema - No row of black specks beneath midlateral row of black spots.................................................. 5 5 8½ branched dorsal rays; usually 9 pectoral rays; 2 pairs of labial barbels............................. A. octoactinotos - 9½ branched dorsal rays, usually 10 pectoral rays; no labial barbels.............................................. 6 6 Small black spot on upper margin of caudal-fin base; 9–17 black spots along side of body; 41–43 total vertebrae..................................................................................................... A. rungthipae - Usually no small black spot on upper margin of caudal-fin base; 13–21 black spots along side of body; 46–48 total vertebrae................................................................................................. A. ioa