Cedromus

Cedromus; Temporal range: Palaeogene PreꞒ Ꞓ O S D C P T J K Pg N ↓
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Rodentia
Family:	Sciuridae
Genus:	†Cedromus; Wilson, 1949
Type species
	Cedromus wardi; Wilson, 1949
Other species
	Cedromus modicus; Cedromus savannae; Cedromus wilsoni;

Cedromus is an extinct genus of sciurid rodent that lived during the Eocene and Oligocene epochs.

Distribution

Cedromus wilsoni is known from Orellan fossil deposits in Converse County, Wyoming.^[1]

Description

Cedromus wilsoni had a greater neocortical surface area, especially in the caudal region of its cerebrum, as compared to ischyromyids such as Ischyromys typus, as well as proportionally larger paraflocculi and a more complex cerebellum. It possessed an encephalisation quotient comparable to that of modern terrestrial squirrels, being higher than that of I. typus but lower than that of scansorial, arboreal, and gliding sciurids.^[2]

References

^ Korth, William W.; Emry, Robert J. (November 1991). "The skull of Cedromus and a review of the Cedromurinae (Rodentia, Sciuridae)". Journal of Paleontology. 65 (6): 984–994. doi:10.1017/S0022336000033291. ISSN 0022-3360. Retrieved 7 April 2025 – via Cambridge Core.
^ Bertrand, Ornella C.; Amador‐Mughal, Farrah; Silcox, Mary T. (1 September 2016). "Virtual endocast of the early Oligocene Cedromus wilsoni (Cedromurinae) and brain evolution in squirrels". Journal of Anatomy. 230 (1): 128–151. doi:10.1111/joa.12537. ISSN 0021-8782. PMC 5192888. PMID 27580644. Retrieved 7 April 2025 – via Wiley Online Library.

[1] Korth, William W.; Emry, Robert J. (November 1991). "The skull of Cedromus and a review of the Cedromurinae (Rodentia, Sciuridae)". Journal of Paleontology. 65 (6): 984–994. doi:10.1017/S0022336000033291. ISSN 0022-3360. Retrieved 7 April 2025 – via Cambridge Core.

[2] Bertrand, Ornella C.; Amador‐Mughal, Farrah; Silcox, Mary T. (1 September 2016). "Virtual endocast of the early Oligocene Cedromus wilsoni (Cedromurinae) and brain evolution in squirrels". Journal of Anatomy. 230 (1): 128–151. doi:10.1111/joa.12537. ISSN 0021-8782. PMC 5192888. PMID 27580644. Retrieved 7 April 2025 – via Wiley Online Library.

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