Gypsonictops is an extinct genus of leptictidan mammals of the family Gypsonictopidae, which was described in 1927 by George Gaylord Simpson.

In 1997, Malcolm C. McKenna and Susan K. Bell suggested the possibility that this family contained up to seven different genera, but documents published since then have shown a high degree of skepticism about the proposal.

It lived during the Campanian and Maastrichtian periods, and fossils have been found in the Hell Creek Formation and other sites in the United States.

[5] When Simpson created the genus Gypsonictops to define this species, placed it within the family Leptictidae, which was then part of the Insectivara order, now obsolete.

It lived during the Maastrichtian, and fossils have been found in the Hell Creek Formation, in the United States, as well as in various paleontological sites in Canada.

They usually used to weigh over fifty gram s. The species name is dedicated to the Captain Meriwether Lewis, a celebrated American explorer.

It is known with certainty that they inhabited the planet during the Maastrichtian, but it is possible that they could have survived the Cretaceous-Paleogene mass extinction and lived until the Danian.

The holotype of this species is in the Carnegie Museum of Natural History and it is a lower jaw that had been badly damaged.