Tragulina

Tragulina (also known as Traguliformes) is an infraorder of even-toed ungulates. Only the chevrotains survive to the present, including the genera Tragulus (the mouse deer) and Hyemoschus, all within the family Tragulidae.

Hypertragulidae is an extinct family of Paleogene ruminants endemic to North America from the Eocene until the Oligocene.

Archaeomerycidae is a family of extinct artiodactyls within the group Tragulina, all members of the family are found in Asian deposits during the Eocene. Members of the family are generally described as some of, if not the most basal ruminants due to their limb anatomy and dentition. Similar to early artiodactyls, these small ungulates were small with long tails and more basal foot morphology. Multiple genera in the family have been described to have been under . Due to the fragmentary remains of the taxa assigned to the group, it has been suggested that the family as a whole could be paraphyl

The Gelocidae are an extinct family of hornless ruminantia that are estimated to have lived during the Eocene and Oligocene epochs, from 36 MYA to 6 MYA. The family generally includes ruminants with dental traits of both the Tragulina and Pecora, making it a notorious wastebasket taxon with unresolved affinities.