Perognathus inornatus
San Joaquin Pocket Mouse
(Perognathus inornatus) | |
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Range | |
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Taxonomic classification | |
Order: | Rodentia |
Suborder: | Supramyomorpha |
Infraorder: | Castorimorphi |
Family: | Heteromyidae |
Subfamily: | Perognathinae |
Genus: | Perognathus |
Binomial details | |
Perognathus inornatus Merriam, 1889 |
Description
From Best (1993): "Perognathus inornatus is a medium-sized Perognathus, with a slightly penciled tail that averages longer than length of head and body (Williams et al., 1993). The ear is small with no antitragal lobe. The posterior one-third of the sole of the hind foot is haired, the pelage is soft, and the vibrissae are rather short (Merriam, 1889). The upperparts are ochraceous buff to pinkish overlaid with blackish hairs; the extent of overlay determines the overall tone in the various subspecies. The lateral line is moderately well marked, underparts are white, and the tail is faintly bicolored (Hall, 1981)."
From Jameson & Peeters (2004): "A small, brown or buff orange pocket mouse with a sprinkling of dark guard hairs (but no spiny hairs) on the dorsum. The body has an indistinct lateral line. There is hair on the heel of the hind foot."
From Wilson et al. (2016): "There is no significant secondary sexual dimorphism. As in other silky pocket mice, pelage of the San Joaquin Pocket is soft, fine, and full, with no hint of spines or stiff bristles; posterior one-half of sole of hindfoot has sparse covering of short hairs; and tail is short. The San Joaquin Pocket Mouse has short, rounded ears without lobed antitragus, and tail is without crest or tuft. The San Joaquin Pocket Mouse is medium-sized for the genus. Dorsal pelage is ocherous buff to pinkish buff, overlaid with blackish hairs; extent of overlay varies among subspecies. The San Joaquin Pocket Mouse has an indistinct buffy post-auricular patch, pale yellowish lateral line, and white under parts. Tail is slightly longer than head-body length and nearly unicolored."
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 |
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California | Jameson & Peeters (2004) | 128–163 | 63–78 | 18–21 | 15–18 | |
rangewide | Best (1993) | males: 148.8 (n=20); females: 146.6 (n=20) | males: 76.2 (n=20); females: 74.5 (n=20) | males: 19.6 (n=20); females: 19.4 (n=20) | males: 7.8 (n=20); females: 7.4 (n=20) | 7.0–12.0 (Koos, 1979); 7.6–8.0 (Warner, 1976) |
rangewide | Wilson et al. (2016) | head and body: 73 | 75 | 20 | 8 | 7–12 |
Skull
Similar species
From Best (1993): "P. inornatus may be sympatric with P. alticolus and [P. mollipilosus]. From these two species, P. inornatus differs in having a less-penciled tail, smaller average size (length of hind foot usually is <21 mm compared with >21 mm), relatively larger mastoid bullae, greater mastoid breadth, and relatively narrower interparietals. From the allopatric species P. fasciatus, P. flavescens, P. flavus, and P. merriami, P. inornatus differs in having a slightly penciled tail averaging longer than head and body, whereas the tails of the other species lack pencils and average shorter than head and body (Williams et al., 1993)."
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Perognathus inornatus -
Great Basin Pocket Mouse (Perognathus mollipilosus)
References
Best TL. 1993. Perognathus inornatus. Mammalian Species (450):1-5.
Hall ER. 1981. The mammals of North America. 2 vols. John Wiley and Sons, New York.
Jameson EW, Peeters HJ. 2004. Mammals of California (No. 66). Berkeley (CA, USA): University of California Press.
Merriam CH. 1889. Preliminary revision of the North American pocket mice (genera Perognathus et Cricetodipus auct.) with descriptions of new species and subspecies and a key to the known forms. North American Fauna 1:1-36.
Williams DF, Genoways HH, Braun JK. 1993. Taxonomy. Pp.38-196, in Biology of the Heteromyidae (HH Genoways and JH Browns, eds.). Special Publications, The American Society of Mammalogists 10:1-719.
Wilson DE, Lacher Jr TE, Mittermeier RA. 2016: Heteromyidae. In: Handbook of the Mammals of the World – Volume 6 Lagomorphs and Rodents I. Barcelona: Lynx Edicions: 170-233, ISBN: 978-84-941892-3-4, DOI: 10.5281/zenodo.6611160