Re-examination of the holotype of Trygon (Himantura) oxyrhynchus Sauvage (MNHN 9639) revealed that it is a species distinct from Himantura uarnak (Forsskål), and a senior synonym of H. krempfi (Chabanaud). Comparisons of the coloration, morphological variations and dermal armature of T. oxyrhynchus and the closely related species Himantura uarnak and H. krempfi show that T. oxyrhynchus is a valid species, re-named Himantura oxyrhyncha (Sauvage), and that H. krempfi could be a juvenile form of T. oxyrhynchus and, thus, a junior synonym. Moreover, the study of MNHN specimens of the H. uarnak complex has shown that some of them could be related to a new species, Himantura sp. A sensu Last & Stevens, 1987; and this species can be differentiated from the other H. uarnak specimens by the number of pectoral radials, morphological characters and coloration.