Ruminantiamorpha is a total clade of artiodactyls defined, according to Spaulding et al.,
as "Ruminantia plus all extinct taxa more closely related to extant members of Ruminantia than to any other living species."
Spaulding grouped some genera of the family Anthracotheriidae within Ruminantiamorpha (but not in Ruminantia), but placed others within Ruminantiamorpha's sister clade, Cetancodontamorpha.

The Tragulidae are the basal family in Ruminantia.
The ancestral Ruminantia karyotype is 2n = 48, similar to that of ancestral cetartiodactyls.

ORDER ARTIODACTYLA
Suborder Suina: pigs and peccaries
Suborder Tylopoda: camels and llamas, 7 living species in 3 genera
Suborder Cetruminantia: ruminants, whales and hippos
unranked Ruminantia
Infraorder Tragulina (paraphyletic)
Family †Prodremotheriidae
Family †Hypertragulidae
Family †Praetragulidae
Family †Protoceratidae
Family Tragulidae: chevrotains, 6 living species in 4 genera
Family †Archaeomerycidae
Family †Lophiomerycidae
Infraorder Pecora
Family Cervidae: deer and moose, 49 living species in 16 genera
Family †Gelocidae
Family †Palaeomerycidae
Family †Hoplitomerycidae
Family †Climacoceratidae
Family Giraffidae: giraffe and okapi, 2 living species in 2 genera
Family Antilocapridae: pronghorn, one living species in one genus
Family †Leptomerycidae
Family Moschidae: musk deer, 4 living species in one genus
Family Bovidae: cattle, goats, sheep, and antelope, 143 living species in 53 genera
Not all ruminants belong to the Ruminantia.
Tylopoda (such as camels, which chew a cud) and Hippopotamidae (such as hippopotami, which do not chew a cud) are classified as pseudoruminants.
A number of other large grazing mammals, e.g. horses and kangaroos, employ hindgut fermentation as an adaptation for surviving on large quantities of low-grade food.

The digestive system of ruminants is composed of:
Mouth
Tongue
Esophagus
Stomach
Rumen
Reticulum
Omasum
Abomasum
Liver (attached gland)
Pancreas (attached gland)
Large intestine
Small intestine
Rectum
Anus
Ruminantiamorpha is a total clade of artiodactyls defined, according to Spaulding et al., as "Ruminantia plus all extinct taxa more closely related to extant members of Ruminantia than to any other living species." Spaulding grouped some genera of the family Anthracotheriidae within Ruminantiamorpha (but not in Ruminantia), but placed others within Ruminantiamorpha's sister clade, Cetancodontamorpha.
The Tragulidae are the basal family in Ruminantia. The ancestral Ruminantia karyotype is 2n = 48, similar to that of ancestral cetartiodactyls.
ORDER ARTIODACTYLA
Suborder Suina: pigs and peccaries
Suborder Tylopoda: camels and llamas, 7 living species in 3 genera
Suborder Cetruminantia: ruminants, whales and hippos
unranked Ruminantia
Infraorder Tragulina (paraphyletic)
Family †Prodremotheriidae
Family †Hypertragulidae
Family †Praetragulidae
Family †Protoceratidae
Family Tragulidae: chevrotains, 6 living species in 4 genera
Family †Archaeomerycidae
Family †Lophiomerycidae
Infraorder Pecora
Family Cervidae: deer and moose, 49 living species in 16 genera
Family †Gelocidae
Family †Palaeomerycidae
Family †Hoplitomerycidae
Family †Climacoceratidae
Family Giraffidae: giraffe and okapi, 2 living species in 2 genera
Family Antilocapridae: pronghorn, one living species in one genus
Family †Leptomerycidae
Family Moschidae: musk deer, 4 living species in one genus
Family Bovidae: cattle, goats, sheep, and antelope, 143 living species in 53 genera
Not all ruminants belong to the Ruminantia. Tylopoda (such as camels, which chew a cud) and Hippopotamidae (such as hippopotami, which do not chew a cud) are classified as pseudoruminants. A number of other large grazing mammals, e.g. horses and kangaroos, employ hindgut fermentation as an adaptation for surviving on large quantities of low-grade food.
The digestive system of ruminants is composed of:
Mouth
Tongue
Esophagus
Stomach
Rumen
Reticulum
Omasum
Abomasum
Liver (attached gland)
Pancreas (attached gland)
Large intestine
Small intestine
Rectum
Anus
Ruminantia