(syn. Hieraaetus Ϯ Ayres's Hawk Eagle H. ayresii) Gr. ανωμαλος anōmalos  anomalous  < negative prefix αν- an- ; ομαλος omalos  even; αετος aetos  eagle; "Another bird, Spizaetus ayresi Gurney (Ibis, 1862, p. 149) has until recently been confused either with Nisaetus spilogaster or Lophaetus occipitalis (cf. Finch-Davies, Ibis, 1919, p. 167, Pl. III); but it is obvious that it cannot be referred to any of the genera of small eagles, and I therefore propose to place it in a new genus, ANOMALAETUS, characterised by having the colour markings of the wing and tail quills as in Lophoaetus, but with a shorter and broader crest, with the short tarsus of Micraetus and in the adult plumage broadly marked below with black on a white ground, much after the fashion of N. spilogaster; in the immature plumage the underparts of the body are plain, as in Micraetus. Nisaetus has long legs and no crest." (A. Roberts 1922).

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).