Key to Scientific Names in Ornithology
(Furnariidae; Ϯ Thorn-tailed Rayadito A. spinicauda) Gr. αφραστος aphrastos marvellous < intensive prefix α- a- ; φραζω phrazō to show; ουρα oura tail; "Oxyurus [Swainson 1837] is, however, untenable in ornithology, by reason of Oxyurus Rafinesque  for a genus of fishes. No other name being available, it may be known as Aphrastura, from αφραστος, mirabilis, and ουρα, cauda, the type being Motacilla spinicauda Gmelin." (Oberholser 1899).