(Bucerotidae; Ϯ Western Little Hornbill H. hartlaubi) Gr. ὁριζω horizō  to limit; κερας keras, κερως kerōs  horn; "HORIZOCERUS, 3 new genus.  Genus generi "Lophoceros" dicto affine, sed cauda valde cuneata, rostro prope recto, hujus cornu minimo, acute carinato, facile distinguendum.  Type.— Toccus hartlaubi Gould.   The strongly wedge-shaped tail, comparatively straight bill, with its very small, sharply keeled casque, to say nothing of conspicuous color differences, appear fully to justify the creation of a separate genus for the species commonly known as Lophoceros hartlaubi.   ...   3ὁριζω, limito; κερας, cornu." (Oberholser 1900).
Var. Orizocerus.
Synon. Ortholophus, Tropicranus.

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 www.hbw.com on 11 December 2018).