Rhynchocyclus is a genus of passerine birds in the tyrant flycatcher family Tyrannidae.
Taxonomy The genus Rhynchocyclus was introduced in 1860 by the German ornithologists Jean Cabanis and Ferdinand Heine as a replacement name for Cyclorhynchus that had been introduced in 1836 by Carl Jakob Sundevall. The name Cyclorhynchus was preoccupied by Cyclorrhynchus that had been introduced in 1829 by Johann Jakob Kaup. The type species is Cyclorhynchus olivaceus Desmarest which is a junior synonym of Platyrhynchos olivaceus Temminck, the eastern olivaceous flatbill. The genus name Rhynchocyclus is an anagram of the original name Cyclorhynchus. The latter combines the Ancient Greek κύκλος/kúklos meaning "circle" or "shield" with ῥύγχος /rhúnkhos meaning "bill".
The genus contains five species: Image Scientific name Common name Distribution Rhynchocyclus brevirostris Eye-ringed flatbill Belize, Colombia, Costa Rica, El Salvador, Guatemala, Honduras, Mexico, Nicaragua, and Panama, with a slight incursion into Colombia Rhynchocyclus pacificus Pacific flatbill Colombia and Ecuador. Rhynchocyclus olivaceus Eastern olivaceous flatbill Brazil, Colombia, French Guiana, Guyana, Suriname, and Venezuela. Rhynchocyclus aequinoctialis Western olivaceous flatbill Bolivia, Colombia, Ecuador, Panama, Peru, and Venezuela. Rhynchocyclus fulvipectus Fulvous-breasted flatbillBolivia, Colombia, Ecuador, Peru, and Venezuela.
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