(syn. Lophoceros Ϯ Crowned Hornbill L. alboterminatus) Gr. προ pro  before; genus Tockus Lesson, 1830, hornbill; "PROTOCKUS1 BRADFIELDI sp. nov.  ...  1 New name for Rhynchaceros, which is preoccupied." (A. Roberts 1931); "Apparently referring to Rhynchoceros Berthold, in Latreille, Nat. Fam. Thierreich, 1827, p. 84." (Peters 1945, V, 255).

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 on 18 January 2019).