Liotomus

Liotomus is a mammal genus from the Paleocene of Europe and North America, and thus lived just after ‘the age of the dinosaurs'. It was a member of the extinct order of Multituberculata.
For those of a technical inclination, it's within the Suborder of Cimolodonta, and possibly the family Cimolodontidae.

Genus: Liotomus Cope ED, 1884
Aka: Neoctenacodon Lemoine, 1891; Neoplagiaulax (partly); Parectypodus (partly)
Remarks: This genus is sometimes placed within Eucosmodontidae Jepsen, 1940.
Reference: Cope (1884), The Tertiary Marsupialia. American Naturalist, 18, p.686-697.

Species: Liotomus marshi (Lemoine, 1882) Cope ED, 1884
Aka: Neoctenacodon marshi; Neoplagiaulax marshi
Place: Cernay
Country: France
Age: Upper Paleocene
Remarks: Has been cited as a descendant of Anconodon gidleyi.
Reference:

Species: Liotomus vanvaleni
Aka: Parectypodus vanvaleni Sloan RE, 1981
Place: San Juan Basin, New Mexico
Country: USA
Age: Puercan, Lower Paleocene
Remarks:
Reference: Sloan (1981), Systematics of Paleocene multituberculates from the San Juan Basin, New Mexico, pp. 127-160, in Lucas et al (eds), Advances in San Juan Basin paleontology. University of New Mexico Press, Alberquerque.

Further remarks: Liotomus sinclairi, (which also seems to have been known as Ptilodus sinclairi), has probably since become Parectypodus sinclairi.

Page references: Kielan-Jaworowska Z & Hurum JH (2001), Phylogeny and Systematics of multituberculate mammals. Paleontology 44, p.389-429.

(This information has been derived from [1] (http://home.arcor.de/ktdykes/ptilodon.htm) MESOZOIC MAMMALS; Ptilodontoidea, an internet directory. As that's my webpage, there are no issues of copyright. Trevor Dykes)