A Closer Look at Prehistoric Mammals. Written by Beverly Halstead. Illustrated by Peter Barrett, Giovanni Caselli, and Richard Orr. 1976.
The Dinictis, interestingly, has been mislabeled as the late Devonian armored fish, Dinichthys.

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A Closer Look at Prehistoric Mammals. Written by Beverly Halstead. Illustrated by Peter Barrett, Giovanni Caselli, and Richard Orr. 1976.
The Dinictis, interestingly, has been mislabeled as the late Devonian armored fish, Dinichthys.
Dinictis felina
A Nimravidae genus from Late Eocene/Early Miocene North America.
Dinictis did not reach large sizes (1.1 m long and 0.6 m high), probably occupying an ecological niche similar to that of some of today's small/medium-sized wild cats, since the position of top predators was occupied by creodonts such as Hyaenodon or entelodonts like Archaeotherium. I must remind you that, although superficially very similar, nimravids like Dinictis were not closely related to true felids, just being another extreme case of convergent evolution.
Impression of Hoplophoneus primaevus, a species of Nimravid or “false saber-tooth cat” that lived in the Eocene to Oligocene of what is now South Dakota.
I thought I'd share some covers of books I've written.
Original jacketed hardback edition of Ratha's Creature, published in 1983 by Atheneum-Argo Margaret K. McElderry
A selection of the basal feliform carnivorans known as nimravids, to scale.
Entelodont and Nimravids. Animal Ghosts. Edited by Claudia Clow. Illustrated by Walt Disney Productions. 1971.
Internet Archive
Nimravids were saber-toothed cat-like animals of the family Nimravidae. Although not true cats in the Felidae family, Nimravidae are considered to be a sister taxon to felids. They are basal
In North America, the fossil record shows a long period where there were no catlike predators present. After the nimravids died out, nothing resembling a cat graced the continent for millions of years. The catless days in between the nimravids and true cats in North America are known as the "cat gap."
They’re not really saber-tooths, and they’re not really cats, but they’re related. They’re Nimravids, and researchers have discovered they fought one