Onychomys torridus
| Southern Grasshopper Mouse
(Onychomys torridus) | |
|---|---|
| Range | |
 | |
| Taxonomic classification | |
| Order: | Rodentia |
| Suborder: | Supramyomorpha |
| Infraorder: | Myomorphi |
| Superfamily: | Muroidea |
| Family: | Cricetidae |
| Subfamily: | Neotominae |
| Tribe: | Onychomyini |
| Genus: | Onychomys |
| Binomial details | |
| Onychomys torridus (Coues, 1874) | |
| Other resources | |
| Full taxonomic details at MDD | |
Description
From McCarty (1975): "O. torridus has forefeet with five plantar tubercles, and hindfeet with four. The soles of feet are covered with fur from heel to beginning of tubercles. The pelage is sharply bicolored, with upper parts grayish to pinkish cinnamon, underparts white and distinctly separated from upper parts. The nasals are wedge-shaped, interorbital constriction narrow, zygomatic plate narrow and straight anteriorly. The length of baculum is 3.9 to 6.5 mm, width at base 0.4 to 0.9 mm. Total body length is 120 to 163 mm. The tail is short, relatively thick, and distally white."
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 |
|---|---|---|---|---|---|---|
| Arizona (Gila, Pinal, and Graham counties) | Hoffmeister (1986) | 136–165 (n=29) | 47–60 (n=29) | 20–23 (n=29) | 16–20 (n=29) | |
| Arizona (Mohave County, vicinity of Pakoon Springs and Lower Pigeon Spring) | Hoffmeister (1986) | 132–144 (n=23) | 45–49 (n=23) | 19–20 (n=23) | 15–17 (n=23) | |
| Arizona (Pima County, vicinity of Baboquivari Mountains) | Hoffmeister (1986) | 135–157 (n=20) | 48–58 (n=20) | 20–24 (n=20) | 16–20 (n=20) | |
| California | Jameson & Peeters (2004) | 120–165 | 39–52 | 18–20 | 11–17 | 20–26 |
Skull
Similar species
1. Total length 130 to 190 mm; tail usually less than half of body length (31 to 57%); maxillary toothrow long (3.8 to 4.8 mm); length of mandible usually more than 14 mm... O. leucogaster. 2. Total length 120 to 163 mm; tail usually more than half of body length (48 to 56%); maxillary toothrow short (3.3 to 4.0 mm); length of mandible usually less than 14 mm...... O. torridus.
From McCarty (1975): "O. torridus differs from O. leucogaster as noted in the key above, and as follows: mandible shorter (12.5 to 14.6 mm and 13.7 to 17.3 mm, respectively), zygomatic breadth narrower (11.9 to 13.7 mm and 12.6 to 17.3 mm, respectively), and smaller braincase (11.0 to 12.3 mm and 11.9 to 13.7 mm in width, respectively."
From Hoffmeister (1986): “O. leucogaster differs from O. torridus in numerous features, all of which are not obvious without careful examination and need to be used in combination. These include: tail less than half the body length, toothrow long, length of M1 usually less than half of the entire toothrow, M3 longer than wide, skull longer and wider (if condylobasal or greatest length is plotted against breadth, there is little or no overlap), baculum longer and bladelike rather than short and thin. If the fur on the underparts is white to the base, the animal is O. leucogaster, although some specimens do have the fur plumbeous as the base as in O. torridus.
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Onychomys torridus -
Northern Grasshopper Mouse (Onychomys leucogaster)
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Onychomys torridus -
Northern Grasshopper Mouse (Onychomys leucogaster)
References
Hoffmeister DF. 1986. Mammals of Arizona. Tucson (AZ, USA): University of Arizona Press.
Jameson EW, Peeters HJ. 2004. Mammals of California (No. 66). Berkeley (CA, USA): University of California Press.
McCarty R. 1975. Onychomys torridus. Mammalian Species (59):1-5.