(syn. Semnornis Ϯ Toucan Barbet S. ramphastinus) Gr. τετραγωνος tetragōnos  square  < τετρα- tetra-  four-  < τεσσαρες tessares  four; γωνια gōnia  angle; ωψ ōps, ωπος ōpos  face, countenance; "Tetragonops ramphastinus (Jardine). - A collection of birds received in the beginning of September last from Professor Jameson of Quito contains a very remarkable form of the Capitonidæ or South American Barbets.  ...  Tetragonops ramphastinus is of a larger size than the greater number of the South American Capitonidæ, and is remarkable for the form of the bill, which is very powerful, and almost square at the base" (Jardine 1855).

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 12 December 2018).