endemic to a single state or province

United States

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

Type of Residency: Year-round

Global Range: (<100-250 square km (less than about 40-100 square miles)) See files for D. NITRATOIDES.

Historic Range:
U.S.A. (CA)

Length: 25 cm

Weight: 50 grams

Differs from other subspecies in mean values for various external and cranial characters; most similar to NITRATOIDES, smaller than BREVINASUS in length of tail (137.7, 137.4, 148.8, in mm, respectively, for NITRATOIDES, Exilis and BREVINASUS), length of hind foot (34.0, 33.4, 36.0), width of bulla (21.6, 21.7, 22.6), and condylobasal length (29.9, 29.7, 31.4); NITRATOIDES has the least amount of red pigment, BREVINASUS the most (see Best 1991).

Type for Dipodomys nitratoides exilis
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Mammals
Sex/Stage: Male; Young adult
Preparation: Skin; Skull
Collector(s): V. Bailey
Year Collected: 1891
Locality: San Joaquin Valley, Fresno, on sand hills 3 mi W of town, [4 mi N of railroad station, along Southern Pacific right of way (see Grinnell 1933)], Fresno County, California, United States, North America
Elevation (m): 100

Comments: See files for D. NITRATOIDES.

Non-Migrant: Yes. At least some populations of this species do not make significant seasonal migrations. Juvenile dispersal is not considered a migration.

Locally Migrant: No. No populations of this species make local extended movements (generally less than 200 km) at particular times of the year (e.g., to breeding or wintering grounds, to hibernation sites).

Locally Migrant: No. No populations of this species make annual migrations of over 200 km.

Comments: See files for D. NITRATOIDES.

Note: For many non-migratory species, occurrences are roughly equivalent to populations.

Estimated Number of Occurrences: 1 - 5

Comments: See files for D. NITRATOIDES.

1 - 1000 individuals

Comments: See files for D. NITRATOIDES.

See files for D. NITRATOIDES.

See files for D. NITRATOIDES.

United States

Rounded National Status Rank: N1 - Critically Imperiled

Rounded Global Status Rank: T1 - Critically Imperiled

Reasons: As of 1980, there were 4-5 known populations, all in a small area of southern California, where limited by restrictive habitat requirements and habitat loss to agriculture and other development.

Current Listing Status Summary

Status: Endangered
Date Listed: 01/30/1985
Lead Region:   California/Nevada Region (Region 8) 
Where Listed:


Population detail:

Population location: entire
Listing status: E

For most current information and documents related to the conservation status and management of Dipodomys nitratoides exilis , see its USFWS Species Profile

Global Short Term Trend: Decline of 10-30%

Comments: See files for D. NITRATOIDES.

Degree of Threat: A : Very threatened throughout its range communities directly exploited or their composition and structure irreversibly threatened by man-made forces, including exotic species

Comments: See files for D. NITRATOIDES.

Biological Research Needs: See files for D. NITRATOIDES.

Global Protection: Few (1-3) occurrences appropriately protected and managed

Comments: See files for D. NITRATOIDES.

Needs: See files for D. NITRATOIDES.