ARTIODACTYLA
The mammal order Artiodactyla (even-toed ungulates) includes ten families:
1) Camelidae (camels and relatives)
2) Suidae (pigs)
3) Tayassuidae (peccaries)
4) Hippopotamidae (hippopotamuses)
5) Tragulidae (chevrotains or mouse deer)
6) Moschidae (Musk-deer)
7) Cervidae (deer)
8) Bovidae (hollow-horned ruminants)
9) Antilocapridae (Pronghorn)
10) Giraffidae (Giraffe and Okapi)
Molecular phylogenetic studies and other evidence (some going back to the 1880s) indicate a close relationship between Artiodactyla and Cetacea (whales). The group Cetartiodactyla is a clade composed of Cetacea + Artiodactyla.
(Lewison 2011 and references therein)
