![]() ![]() Only four species of Chaetodipusare recognized from Pleistocene deposits in the eastern portion of the region, but this likely is due in part to the difficulty in identifying fragmentary material to species. That hispidus could be identified on the basis of breadth of the lower incisorĪnd that most or all of dentaries with the alveolar cheek tooth row less than 3.15 mm The other four species were less than 0.60 and overlapped extensively. They also measured lower incisorīreadth, finding that it exceeded 0.65 mm in hispidus, whereas the breadths in Jaws are given in Table 1, with updated nomenclature. Their maximum and minimum measurements of the alveolar tooth rows of the lower Measurements of 25 adult specimens of each of five species now occurring in the general (which at the time included Chaetodipus) from Fowlkes Cave, took a number of (less than half the transverse distance across the skull at the interparietal comparedĭalquest and Stangl (1984b), looking for ways of identifying Perognathus For many years, Chaetodipus wasĬonsidered a subgenus of Perognathus until elevated to generic status (HafnerĬhaetodipus differs from Perognathus especially in the smaller bullae The population ecology of two species of Costa Rican heteromyid rodents. Social organization in two species of Costa Rican Heteromyid rodents. Liomys salvini (Raton Semiespinosa, Guardafiesta, Spiny Pocket Mouse). A Field Guide to the Mammals of Central America and Southeast Mexico. "Mammalian Species" The American Society of Mammalogist, 1978. "Basal Clades and Molecular Systematics of Heteromyid Rodents". Aggression does not vary according to season. Larger individuals are dominant over smaller individuals, and adults are dominant over the young of the year. This results in the clumping of female home ranges around male home ranges. 20 ha overlap, but intolerance and aggression is shown to members of the same sex. This species is less social than other pocket mice. Most individuals will survive for only one year a few individuals will live to be 15 to 18 months old. Because they are a precocial species, their life spans are short, resulting in a high turnover rate in the population. During this time females undergo a remarkable increase in weight. Reproduction occupies 6 months out of the year (January–June) with an average of 2 litters annually and 4 offspring per litter. They have also reportedly been known to locate seeds that are buried in dung. Because they are nocturnal, they often locate seeds by sense of odor. SPINY POCKET MOUSE CA FULLBecause they are not often satisfied with a single meal, they can be found with cheek pouches full of seeds that are stowed away in their burrows and used when food resources are scarce. ![]() Spiny pocket mouse are found in Southern Nevada, and in the islands of the Gulf of California at elevations up to 900 m (3,000 ft). They can range in body length from 164 to 225 mm (6.5 to 8.9 in). During other seasons these mice eat the seeds of many other species, including plants, corn, wheat, beans, castor beans, and the poisonous seeds of the guanacaste tree. A spiny pocket mouse weighs about 1318 g (0.460.63 oz). In Costa Rica, it favors the seeds of the buttercup tree during the dry season. salvini eat some insects, they are mainly seed-eaters. It is a nocturnal species that lives in a variety of niches, including underground and in bushes, trees, rock clusters, and log shelters, but is most commonly found in brushy, weedy fields that provide shelter to its burrows and protection from predation.Īlthough H. Heteromys salvini reaches its greatest abundance in a geographic range that is mostly semiarid tropical lowland forest. Vector datasets of CWHR range maps are one component of California Wildlife Habitat Relationships (CWHR), a comprehensive information system and predictive. It occupies much of the Pacific coast and adjacent mountains of Central America (from Costa Rica to Guatemala) and southernmost Mexico, usually from the lowlands to elevations of 1500 meters. salvini can be distinguished from other species by the lack of orange side stripes and a lack of dark forelimbs. The tail is approximately equal to the body length, bi-color, and nearly hairless (although it may have a short terminal hair cluster). The darker dorsal fur is meshed with dark spiny hairs and lighter, cream-colored hairs. Although the darkness of the fur can vary quite a bit geographically, it is always grey or grey-brown dorsally with cream-colored underparts, forelegs, and feet. ![]() Like other pocket mice, it has external, fur-lined pouches in its cheeks for carrying seeds and other materials. ![]()
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