(syn. Oxyura Ϯ Ruddy Duck O. jamaicensis) Gr. γυμνος gumnos bare, stripped; ουρα oura tail; "Subgenus. - *GYMNURA. (OXYURA Ϯ. Bonap.) ... Tail long and cuneiform, consisting of 20 narrow, pointed, rigid, and more or less concave feathers: the tail coverts wholly wanting, or undistinguishable from the adjoining plumage. ... ϮThe name of Oxyura having been previously employed for a subgenus of Creepers, it was necessary to alter it." (Nuttall 1834).