Palaealectoris is an extinct monotypic genus of landfowl, belonging to the family Tetraonidae, distantly related with modern grouses. Its fossilized remains, found in the Marsland Formation, a part of the Agate Fossil Beds National Monument in Nebraska, and in the Calvert Formation in Maryland, are dated from the Early Miocene.^[1]

Quick Facts Scientific classification, Binomial name ...

Palaealectoris Temporal range: Early Miocene (Harrisonian) ~24.8–20.4 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Aves
Order:	Galliformes
Family:	Phasianidae
Tribe:	Tetraonini
Genus:	†Palaealectoris Wetmore, 1930
Species:	†P. incertus
Binomial name
†Palaealectoris incertus Wetmore, 1930

Close

The first remains associated with the genus, a fragmentary tibiotarsus, were collected in May 1925 in marine strata belonging to the Miocene-aged Calvert Formation, near Chesapeake Beach, Maryland, by Remington Kellogg and Norman Boss. The holotype remains of Palaealectoris were collected during the summer of 1928 by Erich Maren Schlaikjer in Lower Miocene deposits belonging to the Agate Fossil Beds in Sioux County, Nebraska. The genus was first described shortly after, in 1930, by Alexander Wetmore, at Schlaikjer's demandn, based on the two extremities of a left humerus, with P. incertus as the type species. The Maryland remains were described as Palaealectoris sp.^[1]

Palaealectoris was a medium-sized landfowl, intermediate in size between the bobwhites and the spruce grouse. The superior crest of the humerus shared several similarities in development with that of the chachalacas, although this was probably a convergent adaptation. The general shape of the humerus is however sufficient to assign it to the Tetraonidae family, although it represents an abherrant form.^[1]

The fragmentary tibiotarsus from the Calvert Formation associated with the genus was distinctly similar, although smaller, with that of the modern spruce grouse. It was similar in size with the holotype humerus of P. incertus, which justified its association with the genus.^[1]