Heptacodon

Heptacodon Temporal range:
Life restoration
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Infraclass:	Placentalia
Order:	Artiodactyla
Family:	†Anthracotheriidae
Subfamily:	†Anthracotheriinae
Genus:	†Heptacodon Marsh, 1894a
Type species
†Heptacodon curtus Marsh, 1894a
Species
†H. curtus Marsh, 1894a †H. gibbiceps Marsh, 1894c †H. occidentalis (Osborn & Wortman, 1894) †H. pellionis Storer, 1983 †H. yeguaensis Holroyd, 2002
Synonyms
Genus synonymy Anthracotherium (in part) Octacodon Marsh, 1894b H. curtus synonymy Anthracotherium curtum (Marsh, 1894a) sensu Matthew, 1899 Anthracotherium karense Osborn & Wortman, 1894 Octacodon karense (Osborn & Wortman, 1894) sensu Troxell, 1921 Octacodon valens Marsh, 1894b H. gibbiceps synonymy Anthracotherium gibbiceps (Marsh, 1894c) sensu Matthew, 1899 Octacodon gibbiceps (Marsh, 1894c) sensu Troxell, 1921 H. occidentalis synonymy Anthracotherium curtum (in part) (Marsh, 1894a) sensu Osborn & Wortman, 1894 Anthracotherium occidentale Osborn & Wortman, 1894 Octacodon gibbiceps (in part) (Marsh, 1894c) sensu Troxell, 1921 Heptacodon quadratus Scott, 1940

Heptacodon is an extinct genus of anthracothere endemic to North America during the Paleogene (from the middle Eocene to the early Oligocene). They were medium to large-sized anthracotheres with distinct facial features, such as short heavy rostrums and robust but simple molars. Heptacodon is a member of the anthracothere subfamily Anthracotheriinae, whose distribution as a whole included North America and Eurasia. However Heptacodon has only been found in North America, with the species H. yeguaensis from Texas representing the oldest known anthracotheres to be found in North America dating to the middle Eocene. Fossils of this genus have been found in the states of North Dakota, Oregon, South Dakota, Texas, and Utah.