To increase our knowledge of the morphology of the genus Cetopsorhamdia, a redescription of the type species C. nasus is presented. External morphology, configuration of the skull, complex vertebrae, free vertebrae and associated structures, pectoral and pelvic girdles, dorsal fin, and caudal skeleton are described in detail. A diagnosis for the species, based on comparisons with other valid species in the genus, is proposed. A previous description is discussed, and the position of the genus within the family Heptapteridae and sub-clade Nemuroglanis is validated.