(syn. Anas Ϯ Laysan Duck A. laysanensis) Gr. ὁριζω horizō  to limit; νηττα nētta  duck; "The Laysan teal, Anas laysanensis, is a bird of considerable interest by reason of its rarity and its limited island distribution.  ...  As it is not referable to any other known genus, it becomes necessary to provide a new monotypic generic group for its reception, as follows:  Horizonetta, gen. nov. ϮChars. gen.— Similar to Anas Linnaeus, but bill more spatulate, decidedly wider terminally than at base, more depressed and slightly upturned; basal portion of culmen more elevated, narrower and more sharply ridged; nail of maxilla more triangular; lamellae of maxilla and mandible much less well developed, in places even obsolescent; and tertials relatively longer.  Type.— Anas laysanensis Rothschild.   Remarks.— Excepting Anas Linnaeus, the nearest ally of this peculiar genus is apparently Querquedula Stephens.  ...  Ϯ from ὁριζω, limito; νηττα, anas." (Oberholser 1917).

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 www.hbw.com on 21 January 2019).