[2] The sole species in the genus, Cifelliodon wahkarmoosuch, was found in the geological rock unit called the Yellow Cat Member, part of the Cedar Mountain Formation in Grand County, Utah.

It was found alongside the remains of several dinosaurs - a large iguanodontian, a dromaeosaur, and an ornithopod - and parts of a crocodyliform.

[1] The holotype of Cifelliodon wahkarmoosuch is an exceptionally well-preserved skull, housed at the Natural History Museum of Utah.

However, examining the anatomy of Cifelliodon, Huttenlocker et al. (2018) found it to be closely related to Hahnodon, and placed them outside of Multituberculata and outside the crown mammals.

Krause et al. (2020) recovered Cifelliodon as a basal member of Allotheria, outside of the clade containing Euharamiyida and 'Multituberculata + Gondwanatheria'.