adelos Barrett, 2021 Eusmilus ('true sabre') is a prehistoric genus of nimravid that lived in Europe and North America during the Late Eocene to Early Oligocene epochs (37.2–28.4 mya).

[1] The discovery of E. adelos meanwhile, suggests that nimravids went along derived evolutionary pathways; conical-toothed, dirk-toothed, and scimitar-toothed, with and that their evolutionary paths split in two, leading to saber-toothed and conical-tooth forms that convergently evolved with those of true felids tens of millions of years later.

[2] Most Eusmilus species had a long body and were about as tall as a leopard, though the species E. adelos was similar in size to a small lion, and thus was the largest of the holplophonine nimravids, reaching the weight of nearly 111 kg[2] Eusmilus had developed long saber teeth and looked like a saber-toothed cat, but was actually a so-called 'false saber-tooth"' and only bore this resemblance convergently.

Its mouth could open to an angle of 90 degrees, allowing the creature to properly use its saber teeth.

Bony flanges projected from Eusmilus ' lower jaw to protect the sabers (this is also seen in the unrelated marsupial Thylacosmilus and felid Megantereon).