Palaeoreas was a genus of bovids that lived during the Miocene and the early
part of the Pliocene. Fossils of them have been discovered in Southeastern
Europe and the Middle East.
The late Miocene holotype of Palaeoreas lindermayi was found at Pikermi in
Greece. Other fossils of this species have been unearthed in the Bekka Valley of
Lebanon. The Paleobiology Database gives a span of 11.61 - 5.33 million years
ago for the strata. This interval is upper Miocene and overlaps with the
Messinian and Tortonian stages.
Fossils of Palaeoreas sp. have been found at Sagaidak in the Republic of
Moldova. The time span of the strata is 7.0 - 4.2 million years ago. It overlaps
with the Baodean, Messinian, and Zanclean stages. The interval is late
Miocene/early Pliocene.
Fossils of Palaeoreas have also been found in Bulgaria. Denis Geraads,
Nikolai Spassov, and Dimitar Kovachev wrote an article about the significance of
a fossil specimen discovered there. The title is Palaeoreas lindermayi (Wagner,
1848) (Mammalia, Bovidae) from the upper Miocene of Bulgaria, and a revision of
the species. It was published in 2003 in Geodiversitas 25(2), 405-415. This
excerpt from the abstract says:

Palaeoreas lindermayi (Wagner, 1848) is represented in the upper Miocene of
Hadjidimovo-1 (Bulgaria) by what may be the largest known sample of a bovid
fossil species from a single locality. The size of the animals is on the average
larger than at the type locality, Pikermi, but the biochronological usefullness
of size and other interpopulational differences remains, in our opinion,
doubtful.

The authors state that Palaeoreas was likely a gregarious and territorial
bovid. However, they also say that it cannot be classified as being in any
modern tribe. This excerpt says:

The Turkish species Palaeoreas elegans Ozansoy, 1965 and P. Brachyceras Ozansoy,
1965 have spiralled (instead of twisted) horn-cores, unfused interfrontal
suture, and supra-orbital foramina of normal shape, and there is no reason to
include them in the genus Palaeoreas. P. asiaticus from Garkin (Kohler 1987) was
considered by Gentry & Heiszman (1996: 383) as "doubtfully separate from P.
lindermayi, but it is still smaller than the latter species, the inter-frontal
suture is visible, and the posterior keel is almost straight instead of
spiralled. These are all similarities with "P" elegans, and we think it is
closer to this species than to P. lindermayi, even though the tight spiralling
recalls that of the latter species.

This portion of the main text says:

Overall, the cranio-morphology of Palaeoreas has no modern equivalent, and it is
hard to draw definitive conclusions about its fighting behavior.

This excerpt says:

This certainly has no bearing on the systematic position of Palaeoreas, whose
skull is quite distinct from that of Antilope. Reducines could be a modern
equivalent for the social structure, but their forwardly directed horn tips and
related very prominent anterior tuberosities of basioccipital, typical for the
tribe, are missing here. It is more reasonable not to refer Palaeoreas to any
modern tribe.

Though Palaeoreas is apparently not of any modern tribe, it is a member of
the Antilopinae subfamily. Living members of Antilopinae include gazelles,
springboks, and gerenuks.

Neal Robbins

P.S. The taxonomy of Palaeoreas is:

Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Artiodactyla
Suborder: Ruminantia
Family: Bovidae
Subfamily: Antilopinae
Genus: Palaeoreas
The species are:

Palaeoreas lindermayi
P. sp.