1) False sabertoothed tigers 2) Genus nimravus 3) Mammal genus 
Nimravus is an extinct genus of the family Nimravidae, subfamily Nimravinae (false saber-toothed cat) endemic to North America during the Oligocene epoch (33.3—26.3 mya), existing for approximately {Mya|33.3-26.3|million years}. ==Taxonomy== Nimravus was named by Cope (1879) [status called into question by Bryant 1996]. It is the type genus of N...
(from the article `sabre-toothed cat`) ...through the Pleistocene epochs (36.6 million to 10,000 years ago). The Nimravidae lived until about 7 million years ago. Only distantly related to ...
[n] - false sabertoothed tigers
genus Nimravus noun false sabertoothed tigers