(syn. Picoides Ϯ Eurasian Three-toed Woodpecker P. tridactylus) Gr. negative prefix α- a- ; πτερνη pternē  heel, foot; "Plumage black and white; feet three-toed.  Apternus.*  ... * We have not considered it expedient to adopt the name of Tridactylia, given, in a modern compilation, to all the three-toed Woodpeckers indiscriminately, since it would obviously lead to much confusion. Besides, we have long had the genus Tridactylus in Entomology.  ... Sub-genus, Apternus Ϯ, pl. 56, SWAINS.  ...Ϯ Th. α, priv., et πτερνα, calx" (Swainson 1831).

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 15 December 2018).