(Trochilidae; Ϯ Racquet-tailed Coquette D. longicauda) Gr. δισκος diskos  plate; ουρα oura  tail. "The tail above, greenish brown, beneath of reddish or yellowish white. The feathers, excepting the two outer ones, are pointed, and assume a slightly forked form. The two on the outside exceed the others by about half their own length, and the shafts commence to be entirely bare where they exceed the length of the others, and are finished by a nearly round tip of black plume in the form of a racket-board" (Jardine 1833); "*198. Discosura, Bp. (Platurus, p. Less. - Mellisuga, p. Gr.)  America m.  2.    1. TROCHILUS longicaudus, Gm. (platurus, Lath.) Vieill. Ois. dor. t. 60. - Less. Ois.-Mouch. t. 40.  ex Gujana.    2. TROCHILUS ligonicaudus, Gould, (Ocreatus! ligonicaudus, Gould.) Pr. Zool. Soc. 1846.  ex Brasil." (Bonaparte 1850); "Discosura Bonaparte, Consp. Av., 1, Mar., 1850, p. 84. Type, by subsequent designation, Trochilus longicaudus Gmelin. (G. R. Gray, Cat. Gen. Subgen. Bds., 1855, p. 22.)" (Peters 1945, V, 35).   
Var. Discura.
Synon. Gouldia, Gouldomyia, Mytinia, PlaturusPopelairia, Prymnacantha, Tricholopha.

Search for more names on the Key to Scientific Names in Ornithology by James A. Jobling.
Recommended citation
Jobling, J. A. (2018). Key to Scientific Names in Ornithology. In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.) (2018). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from www.hbw.com on 17 December 2018).