''Lambdoceras'' is an extinct

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...

Protoceratidae Protoceratidae is an extinct family of herbivorous North American artiodactyls (even-toed ungulates) that lived during the Eocene through Pliocene at around 46.2—4.9 Mya, existing for about 41 million years. Classification Protoceratidae was ...

belonging to the order

Artiodactyla The even-toed ungulates (Artiodactyla , ) are ungulates—hoofed animals—which bear weight equally on two (an even number) of their five toes: the third and fourth. The other three toes are either present, absent, vestigial, or pointing poster ...

(subfamily

Synthetoceratinae Synthetoceratinae is an extinct subfamily of Protoceratidae, deer-like herbivorous mammals belonging to the order Artiodactyla. They were endemic to North America during the Miocene epoch, living 23.03—3.9 Ma, existing for approximately . ...

) endemic to

North America North America is a continent in the Northern Hemisphere and almost entirely within the Western Hemisphere. It is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South America and the Car ...

during the

Miocene The Miocene ( ) is the first geological epoch of the Neogene Period and extends from about (Ma). The Miocene was named by Scottish geologist Charles Lyell; the name comes from the Greek words (', "less") and (', "new") and means "less recen ...

, living epoch 20.6—13.6 Ma, existing for approximately .

Taxonomy

A description of the genus ''Lambdoceras'' by Ruben A. Stirton was published in 1967. Its type is ''Lambdoceras hessei''. It was synonymized subjectively with '' Prosynthetoceras'' by Patton (1969), Patton and Taylor (1971) and Patton and Taylor (1973). It was assigned to

by Stirton (1967), Tedford et al. (1987) and Albright (1999); and to Synthetoceratini by Webb (1981), Prothero (1998), Webb et al. (2003) and Prothero and Ludtke (2007).D. R. Prothero and J. A. Ludtke. 2007. Family Protoceratidae. in D. R. Prothero and S. Foss (eds.), The Evolution of Artiodactyls 169-17

References

{{Taxonbar, from=Q6481181 Protoceratids Miocene even-toed ungulates Miocene mammals of North America Fossil taxa described in 1967 Prehistoric even-toed ungulate genera