''Eodelphis'', from

eo- This is a list of common affixes used when scientifically naming species, particularly extinct species for whom only their scientific names are used, along with their derivations. *a-, an-: ''Pronunciation'': /ə/, /a/, /ən/, /an/. ''Origin' ...

plus /nowiki>/nowiki>''delphis'', thus meaning "very early opossum", is a genus of stagodont

metatheria Metatheria is a mammalian clade that includes all mammals more closely related to marsupials than to placentals. First proposed by Thomas Henry Huxley in 1880, it is a more inclusive group than the marsupials; it contains all marsupials as well ...

ns from the Late

Cretaceous The Cretaceous ( ) is a geological period that lasted from about 145 to 66 million years ago (Mya). It is the third and final period of the Mesozoic Era, as well as the longest. At around 79 million years, it is the longest geological period of th ...

of North America, with distinctive crushing dentition. Named species include ''E. browni'' and the more advanced ''E. cutleri''. Both come from the Late

Campanian The Campanian is the fifth of six ages of the Late Cretaceous Epoch on the geologic timescale of the International Commission on Stratigraphy (ICS). In chronostratigraphy, it is the fifth of six stages in the Upper Cretaceous Series. Campanian s ...

(

Judithian The Judithian was a North American faunal stage lasting from 83.5 to 70.6 million years ago. It overlaps with the Campanian global stage. Fauna Dinosaur faunas of the Judithian age may represent the peak of dinosaur evolution in North America. H ...

"Land Mammal Age") of

Dinosaur Provincial Park Dinosaur Provincial Park is a UNESCO World Heritage Site situated a two hour drive east of Calgary, Alberta, Canada; or , about a half-hour drive northeast of Brooks. The park is situated in the Red Deer River valley, which is noted for its strik ...

Alberta Alberta ( ) is one of the thirteen provinces and territories of Canada. It is part of Western Canada and is one of the three prairie provinces. Alberta is bordered by British Columbia to the west, Saskatchewan to the east, the Northwest Ter ...

. Specimens are also known from the

Judith River Formation The Judith River Formation is a fossil-bearing geologic formation in Montana, and is part of the Judith River Group. It dates to the Late Cretaceous, between 79 and 75.3 million years ago, corresponding to the "Judithian" land vertebrate age. It ...

Montana Montana () is a state in the Mountain West division of the Western United States. It is bordered by Idaho to the west, North Dakota and South Dakota to the east, Wyoming to the south, and the Canadian provinces of Alberta, British Columbi ...

. ''E. cutleri'' is related to the

Maastrichtian The Maastrichtian () is, in the ICS geologic timescale, the latest age (uppermost stage) of the Late Cretaceous Epoch or Upper Cretaceous Series, the Cretaceous Period or System, and of the Mesozoic Era or Erathem. It spanned the interval from ...

genus ''

Didelphodon ''Didelphodon'' (from ''is''/nowiki>.html" ;"title="/nowiki>''is''/nowiki>">/nowiki>''is''/nowiki> "opossum" plus "tooth") is a genus of stagodont metatherians from the Late Cretaceous of North America. Description Although perhaps little la ...

'' as indicated by its enlarged

premolar The premolars, also called premolar teeth, or bicuspids, are transitional teeth located between the canine and molar teeth. In humans, there are two premolars per quadrant in the permanent set of teeth, making eight premolars total in the mouth ...

s and more robust jaw. ''Eodelphis'' was probably an aquatic predator like its relative ''

'', and may have weighed about 0.6 kg (1.3 lb), making it one of the largest mammals of its time.

References

* Cifelli, R. L., Z.-X. Luo, et al. (2004). Mammals from the Age of Dinosaurs: Origins, Evolution and Structure. New York, Columbia University Press. * Clemens, W. A., Jr. (1979). Marsupialia. Mesozoic mammals: the first two-thirds of mammalian history. J. A. Lilligraven, Kielan-Jaworowska and W. A. Clemens, Jr. Berkeley, University of California Press: 192–220. * Matthew, W. D. (1916). "A marsupial from the Belly River Cretaceous. With critical observations upon the affinities of the Cretaceous mammals." Bulletin of the American Museum of Natural History 35: 477–500. * Sahni, A. (1972). "The vertebrate fauna of the Judith River Formation, Montana." Bulletin of the American Museum of Natural History 147(6): 323–412. * Smith Woodward, A. (1916). "On a mammalian mandible (Cimolestes cutleri) from an Upper Cretaceous formation in Alberta, Canada." Proceedings of the Zoological Society of London 158: 525–528. Prehistoric metatherians Late Cretaceous mammals of North America Fossil taxa described in 1916 Prehistoric mammal genera {{cretaceous-mammal-stub