(syn. Aythya Ϯ Ring-necked Duck A. collaris) Gr. περισσος perissos  wonderful; νηττα nētta  duck; "Perissonetta, gen. nov. 1   Diagnosis.— Similar to Nyroca, but length of exposed culmen equal to length of inner toe with claw (instead of decidedly shorter); feathering on sides of maxilla extending forward as far as the feathering at the base of the culmen; anterior outline of feathering at the base of culmen broadly convex; and length of wing only about 4 times the length of exposed culmen.  ...  Type. — Anas collaris Donovan.  ...  As the characters that we have above given show, this species forms one of the most trenchantly distinct groups among the genera allied to Nyroca.  ...  1 perissós, mirabilis; nētta, anas." (Oberholser 1921).

Search for more names on the Key to Scientific Names in Ornithology by James A. Jobling.
Recommended citation
Jobling, J. A. (2020). Key to Scientific Names in Ornithology. In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.) (2020). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from on 24 February 2020).