(syn. Phaethornis Ϯ Planalto Hermit P. pretrei) Gr. ανισος anisos  unequal  < negative prefix αν- an- ; ισος isos  equal; -πτερος -pteros  -feathered  < πτερον pteron  feather; "Anisoterus  ... Rectricibus subexternis ad submedias inæqualiter longioribus" (Mulsant & E. Verreaux 1874).

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 on 11 December 2018).