A New Species of Euchiloglanis Regan, 1907 (Actinopterygii: Sisoridae) from Vietnam

A new species of sisorid catfish of the genus Euchiloglanis is described from the Gam River, a tributary of the Red River in northern Vietnam. Euchiloglanis nami sp. n. differs from all the species placed in Euchi-loglanis and Chimarrichthys by having elongated papilae on the ventral part of maxillary barbell. Euchi-loglanis nami is distinguished from E. longibarbatus by having a wider premaxillary tooth band without indentation and the tip of the maxillary barbell reaching pectoral fin origin. The new species differs from E. davidi and E. kishinouyei by the depth of the caudal peduncle equal to 20.26-27.40 % of the caudal -peduncle length. It also differs from E. dorsoarcus by the anal-fin position being closer to the caudal-fin base than to the pelvic fin. From E. phongthoensis, it differs by the distance from the adipose-fin origin to the dorsal-fin insertion close to 50 % of the length of the adipose-fin base. In addition, E. nami differs from E. longus by having a wider premaxillary tooth band without indentation, shorter caudal peduncle (20.7 % SL), higher caudal peduncle depth (5.0 % SL), shorter distance between dorsal-fin insertion to adipose -fin origin (14.8 % SL), shorter distance from snout to adipose-fin origin (57.4 % SL), shorter pelvic fins length (15.9 % SL) reaching the anus or a little beyond anus, longer adipose-fin base length (33.2 % SL) and narrower interorbital width (24.6 % SL). The new species is the first record of the genus Euchiloglanis in the Gam-Lo River system and is the third species in the genus from Vietnam.