Hyainailourinae
Hyainailourinae is a paraphyletic subfamily of hyaenodonts from extinct paraphyletic family Hyainailouridae. They arose during the Middle Eocene in Asia, and persisted well into the Late Miocene. Fossils of this group have been found in Africa, Eurasia, and North America.Hyainailourins are characterized by long skulls, slender jaws, slim bodies, and a plantigrade stance. They generally ranged in size from 30 to 140 cm at the shoulder. While some measured as much as 1.4 m high at the shoulder with head-body length up to 3.2 m and weighed up to 500 kg, most were in the 5–15 kg range, equivalent to a mid-sized dog. The anatomy of their skulls show that they had a particularly acute sense of smell, while their teeth were adapted for shearing, rather than crushing.Taxonomy