****Palaeoryctidae ("ancient diggers") is an extinct family of non-specialized eutherian mammals from extinct order Palaeoryctida, that lived in North America, Europe, Asia and Africa from the late Cretaceous to the middle Eocene.

Description

From a near-complete skull of the genus Palaeoryctes found in New Mexico, it is known that palaeoryctids were small, shrew-like insectivores with an elongated snout similar to that of the leptictids. However, in contrast to the latter, little is known about palaeoryctids' postcranial anatomy (the skeleton without the skull). A 2024 study found shared cranial details between palaeoryctids and leptictids, suggesting a possible close relationship, plesiomorphic retentions, or convergent acquisitions. Where the leptictids were short-lived, the palaeoryctids seem to have been ancestors of Eocene species. While their dental morphology still indicate a mostly insectivorous diet, it, to some extent, also relate to Eocene carnivores such as creodonts.

Taxonomy and phylogeny

History of phylogeny

The relationship between this archaic group and other insectivorous mammals is uncertain. Palaeoryctidae was originally assigned to the now-abandoned grouping Insectivora by Sloan and Van Valen (1965), then to clade Proteutheria, and more recently to Eutheria by Scott et al. (2002). Generally speaking Palaeoryctidae has been used as a wastebasket taxon for many archaic insectivorous mammals. According to a 2022 study by Bertrand et al., palaeoryctids are identified to be a basal group of placental mammals.

Taxonomy

Phylogeny