Synthetoceratinae is a subfamily of Protoceratidae

Protoceratidae

Protoceratidae is an extinct family of herbivorous North American artiodactyls that lived during the Eocene through Pliocene at around 46.2—4.9 Ma., existing for approximately .-Taxonomy:...

 (deer-like) herbivorous mammals belonging to the order Artiodactyla endemic to North America

North America

North America is a continent wholly within the Northern Hemisphere and almost wholly within the Western Hemisphere. It is also considered a northern subcontinent of the Americas...

 during the Miocene

Miocene

The Miocene is a geological epoch of the Neogene Period and extends from about . The Miocene was named by Sir Charles Lyell. Its name comes from the Greek words and and means "less recent" because it has 18% fewer modern sea invertebrates than the Pliocene. The Miocene follows the Oligocene...

 epoch, living 23.03—3.9 Ma, existing for approximately .

Taxonomy

Synthetoceratinae was named by Frick (1937). Its type is Synthetoceras. It was considered monophyletic by Webb et al. (2003). It was assigned to Protoceratidae

Protoceratidae

Protoceratidae is an extinct family of herbivorous North American artiodactyls that lived during the Eocene through Pliocene at around 46.2—4.9 Ma., existing for approximately .-Taxonomy:...

 by Webb (1981), Prothero (1998), Webb et al. (2003), Hulbert and Whitmore (2006) and Prothero and Ludtke (2007).

Tribes

Synthetoceratinae contains the tribes Kyptoceratini

Kyptoceratini

Kyptoceratini is an extinct tribe of the subfamily Synthetoceratinae, deer-like mammals within the family Protoceratidae belonging to the order Artiodactyla, endemic to North America during the Miocene through Pliocene, living 23.03—3.6 Ma, existing for approximately .-Taxonomy:Kyptoceratini is a...

 and Synthetoceratini

Synthetoceratini

Synthetoceratini is an extinct tribe of the subfamily Synthetoceratinae within the family Protoceratidae belonging to the order Artiodactyla endemic to North America during the Miocene, living epoch 20.6—4.9 Ma, existing for approximately .-Taxonomy:...

. Within these tribes are the genus Kyptoceras

Kyptoceras

Kyptoceras is a small extinct genus of Artiodactyla, of the family Protoceratidae, endemic to southeastern North America from the Miocene to Early Pliocene epoch 23.03—3.6 Ma, existing for approximately .-Taxonomy:...

 and Syndyoceras

Syndyoceras

Syndyoceras is a small extinct genus of Artiodactyla, of the family Protoceratidae, endemic to central North America from the Eocene epoch 24.8—20.6 Ma, existing for approximately .-Taxonomy:...

respectively.