Rheidae

Rheidae is a family of flightless ratite birds which first appeared in the Paleocene. It is today represented by the sole living genus Rhea, but also contains several extinct genera.

Taxonomy
Order Rheiformes (Forbes, 1884) Furbringer, 1888 [Rheimorphae Bonaparte, 1849 ; Rheae Forbes 1884 ]
 * Family †Opisthodactylidae Ameghino 1895
 * Genus ?†Diogenornis de Alvarenga 1983 (Late Paleocene) – possibly a member of Casuariiformes instead.
 * Genus †Opisthodactylus Ameghino 1895 (Miocene) – rheid?
 *  Family Rheidae (Bonaparte 1849) Bonaparte, 1853
 * Genus †Heterorhea Rovereto 1914 (Pliocene)
 * Genus †Hinasuri Tambussi 1995
 * Genus Rhea Brisson 1760