Neotamias grisescens

Coulee Chipmunk
(*Neotamias grisescens*)
Coulee Chipmunk (Neotamias grisescens)
Range
Taxonomic classification
Order:	Rodentia
Suborder:	Sciuromorpha
Family:	Sciuridae
Subfamily:	Xerinae
Tribe:	Tamiini
Genus:	Neotamias
Binomial details
	Neotamias grisescens (A. H. Howell, 1925)
Other resources
	Full taxonomic details at MDD

The Coulee Chipmunk (Neotamias grisescens) is a small, light gray chipmunk that occupies a restricted range from the Channeled Scablands of central Washington.

Description

Using genomic data, Herraera et al. (2022) found that grisescens does not fall within the considerable genetic diversity of the least chipmunk (Neotamias minimus) or other sampled species, and they proposed that grisescens is in fact a novel, cryptic chipmunk species, the Coulee Chipmunk (Neotamias grisescens). They note that "a formal description awaits additional geographic sampling."

Museum images

Holotype: USNM 89701. Neotamias grisescens. Sub-adult male. Farmer, Douglas County, Washington. Collected 31 July 1897.
Holotype: USNM 89701. Neotamias grisescens. Sub-adult male. Farmer, Douglas County, Washington. Collected 31 July 1897.
Holotype: USNM 89701. Neotamias grisescens. Sub-adult male. Farmer, Douglas County, Washington. Collected 31 July 1897.

Distribution

Restricted to the Channeled Scablands of central Washington.

External measurements

Length measurements are in millimeters (mm) and weight measurements are in grams (g), unless stated otherwise. If available, the sample size (n=) is provided. If a range is not provided and n= is not given, then the listed measurement represents an average.

Part of range	Reference	Total length	Tail length	Hindfoot length	Ear length	Mass
Washington (Douglas County)	Holotype: USNM 89701	167	76	27

Skull

Holotype: USNM 89701. Neotamias grisescens. Sub-adult male. Farmer, Douglas County, Washington. Collected 31 July 1897. Dorsal view of the skull.
Holotype: USNM 89701. Neotamias grisescens. Sub-adult male. Farmer, Douglas County, Washington. Collected 31 July 1897. Ventral view of the skull.
Holotype: USNM 89701. Neotamias grisescens. Sub-adult male. Farmer, Douglas County, Washington. Collected 31 July 1897. Lateral view of the skull.
Holotype: USNM 89701. Neotamias grisescens. Sub-adult male. Farmer, Douglas County, Washington. Collected 31 July 1897. Dorsal view of the mandible.
Holotype: USNM 89701. Neotamias grisescens. Sub-adult male. Farmer, Douglas County, Washington. Collected 31 July 1897. Lateral view of the left mandible.

Similar species

Content will be coming to this page in the near future. Please return soon and let us know if you have information or ideas to contribute!

References

Herrera ND, Bell KC, Callahan CM, Nordquist E, Sarver BA, Sullivan J, Demboski JR, Good JM. 2022. Genomic resolution of cryptic species diversity in chipmunks. Evolution 76(9): 2004-2019.