[1] It was found in the Tapinocephalus Assemblage Zone strata of South Africa, an area which provides a rich variety of early therapsids and covers a period of almost 100 million years ranging from the Permian to the Jurassic.

Also found in the Pristerognathus Assemblage Zone, Eosimops occurs in association with animals like Eunotosaurus and scylacosaurid therocephalans.

Eosimops had two long tusks on its upper jaw,[3] and a cutting keratinized beak[4] for processing vegetation.

A dorsally directed portion of the premaxilla with a rounded edge projects between the nasals, diagnostic of dicynodonts thanks to the narrow groove along its midline.

[1] The left and right dentaries of Eosimops’ mandible were fused, and the anterior surface sported a vascular foramina which was likely associated with a keratinaceous beak.

[1] The jaw joint facilitated a fore and aft sliding motion, allowing the animal to process vegetation effectively.

The dorsal ribs of Eosimops were long and relatively thin, and there was a ventral component to the curvature of the thorax.

[1] Both the fore and hind limbs possessed extended phalanges with long, flattened claws, which suggests that Eosimops was a digger.

Like Diictodon, Eosimops likely used its forelimbs for postural support and digging and its hind limbs for impact loading.

[10] In a histological study of the closely related Diictodon, another pylaecephalid, rapid bone growth is shown to be part of their early ontogeny.

This would be consistent with the hypothesis that more derived dicynodonts were endotherms, as endothermy would likely have been evolved early in the taxon's history.