The family Peramuridae is a family of mammals that lived in the

Late Jurassic The Late Jurassic is the third Epoch (geology), epoch of the Jurassic Period, and it spans the geologic time scale, geologic time from 161.5 ± 1.0 to 143.1 ± 0.8 million years ago (Ma), which is preserved in Upper Jurassic stratum, strata.Owen ...

and

Early Cretaceous The Early Cretaceous (geochronology, geochronological name) or the Lower Cretaceous (chronostratigraphy, chronostratigraphic name) is the earlier or lower of the two major divisions of the Cretaceous. It is usually considered to stretch from 143.1 ...

. They are considered to be advanced cladotherians, closely related to therian mammals as part of Zatheria.

References

* Cladotheria Jurassic mammals Prehistoric mammal families Tithonian first appearances Berriasian extinctions {{cretaceous-mammal-stub