Recently proposed splits for the family Puffbirds
White-necked Puffbird      Notharchus macrorhynchos
(Gmelin)   1788
s Mexico s to e Peru, n Bolivia, n Brazil (roughly greater Amazon basin)
 
Buff-bellied Puffbird      Notharchus swainsoni
(Gray-GR)   1846
Paraguay; ne Argentina: Misiones; se Brazil: Espírito Santo to Santa Catarina
split from: Notharchus macrorhynchos
insert after: Notharchus macrorhynchos
P.C. Rasmussen & N.J. Collar,
Family Bucconidae (Puffbirds), p. 102-138, in: Handbook of the Birds of the World. Vol. 7, J. del Hoyo, A. Elliott & J. Sargatal (eds.), Barcelona, 2002
 
Russet-throated Puffbird      Hypnelus ruficollis
(Wagler)   1829
n Colombia; nw Venezuela: to just s and e of Lk. Maracaibo
 
Two-banded Puffbird      Hypnelus bicinctus
(Gould)   1837
ne Colombia: interior llanos; n Venezuela: s to ne Bolivar and nw Amazonas, Isla Margarita
split from: Hypnelus ruficollis
insert after: Hypnelus ruficollis
P.C. Rasmussen & N.J. Collar,
Family Bucconidae (Puffbirds), p. 102-138, in: Handbook of the Birds of the World. Vol. 7, J. del Hoyo, A. Elliott & J. Sargatal (eds.), Barcelona, 2002
 
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