Lambdoceras

Lambdoceras is an extinct genus of Protoceratidae belonging to the order Artiodactyla (subfamily Synthetoceratinae) endemic to North America during the Miocene, living epoch 20.6—13.6 Ma, existing for approximately 7 million years.^[1]

Lambdoceras Temporal range: Miocene PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Artiodactyla
Family:	†Protoceratidae
Tribe:	†Synthetoceratini
Genus:	†Lambdoceras Stirton 1967
Species
Lambdoceras hessei Lambdoceras siouxensis Lambdoceras trinitiensis
Range of Lambdoceras based on fossil data

Taxonomy

A description of the genus Lambdoceras by Ruben A. Stirton was published in 1967. It was synonymized subjectively with Prosynthetoceras by Patton (1969), Patton and Taylor (1971) and Patton and Taylor (1973). It was assigned to Protoceratidae 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).^[2][3][4][5]

There are three species; the type Lambdoceras hessei, L. siouxensis, and L. trinitiensis.^[6]