The genus
Cimolodon was named by
Othniel Charles Marsh in 1889. Kielan-Jaworowska & Hurum (2001) noted that
Cimolodon seems to be more closely related to members of their "
Paracimexomys" group than to other ptilodontoideans.
Species Cimolodon electus (Fox R.C. 1971) is known from the Upper
Cretaceous of the Upper
Milk River Formation in
Alberta,
Canada. Possible finds have been reported from
New Mexico.
Cimolodon nitidus (Marsh O.C. 1889) is known from Late Cretaceous
strata of the
Lance Formation of
Wyoming,
Utah,
Montana and
South Dakota (
United States) as well as Alberta and
Saskatchewan (Canada). Synonyms include
Allacodon lentus (Marsh, 1889);
Allacodon rarus (Marsh, 1892);
Cimolomys bellus (Marsh, 1889);
Cimolomys digona (Marsh, 1899);
Cimolomys nitidus;
Halodon serratus (Marsh, 1889);
Nanomyops minitus (Marsh, 1892);
Nanomys minitus (Marsh, 1889); and
Ptilodus serratus (Gidley, 1909).
Cimolodon parvus (Marsh O.C. 1892) is also known from the Upper Cretaceous Lance Formation of Wyoming. A specimen referred to as
C. cf.
nitidus has been recovered from the
Prince Creek Formation.
Cimolodon similis (Fox R.C. 1971) is known from the Late Cretaceous (
Santonian-early
Campanian) of Alberta and Utah.
C. wardi is known from the
Wahweap Formation of Utah.
Cimolodon akersteni is known from the
Cenomanian-age
Wayan Formation of Idaho.
Cimolodon desosai is known from specimen IGM 14691, a partial skull and mandible, in addition to part of the
ulna,
femur, and vertebrae. These remains were found in the
Campanian-aged
El Gallo Formation (El Disecado Member) of Baja California, Mexico. ==References==