(syn. Picoides Ϯ Three-toed Woodpecker P. tridactylus) Gr. τριδακτυλος tridaktulos  three-toed  < τρι- tri-  three-  < τρεις treis, τρια tria  three; δακτυλος daktulos  toe; "TRIDACTYLIA.  ...  Feet with only three toes, placed two before and one behind.   WE have separated this genus from Picus on account of the number of toes, this having but threee, whereas the genuine Pici are all furnished with four, as already mentioned in our generic character.   DOWNY TRIDACTYLIA. (Tridactylia hirsuta.)  ...  Picus hirsutus. Vieil. Ois. de L'Amer. Sept. 2. 68.   Picus tridactylis. Lin. Syst. Nat. I. 177. 21.  ...  Three-toed Woodpecker. Edw. 114" (Stephens 1815).

Search for more names on the Key to Scientific Names in Ornithology by James A. Jobling.
Recommended citation
Jobling, J. A. (2019). Key to Scientific Names in Ornithology. In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.) (2019). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from on 22 January 2019).