Necromys urichi (J. A. Allen & Chapman, 1897)
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publication ID |
https://doi.org/ 10.5281/zenodo.6707142 |
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DOI |
https://doi.org/10.5281/zenodo.6727420 |
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persistent identifier |
https://treatment.plazi.org/id/03F06D13-FF10-20D8-0898-1CF909B2FD70 |
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treatment provided by |
Carolina |
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scientific name |
Necromys urichi |
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545. View Plate 25: Cricetidae
Northern Akodont
French: Akodon d'Urich / German: Nordliche Graslandmaus / Spanish: Raton cavador septentrional
Other common names: Northern Grass Mouse
Taxonomy. Akodon urichi J. A. Allen & F. M. Chapman, 1897 View in CoL , Caparo, Trinidad, Trinidad and Tobago.
Necromys urichi is the type species of subgenus Chalcomys , currently considered a synonym of Necromys . As presently understood, N. wurichi is a composite of several taxa. On morphological grounds, N. urichi is the most divergent species of Necromys .
Monotypic.
Distribution. Colombia, Venezuela, Trinidad and Tobago Is, and W Guyana; possibly extreme N Brazil. View Figure
Descriptive notes. Head-body 107-141 mm, tail 69-102 mm, ear 16-19 mm, hindfoot 22-29 mm; weight 30-61 g. See general characters of the genus under the Ecuadorean Akodont (N. punctulatus ) account. The Northern Akodont is a small species of Necromys . Dorsum is dark rusty chestnut, finely intermixed with black; venter is washed with yellowish or has pale to medium gray tips, but always with dark-based hairs; hair tips of chin, throat, and around inguinal area are gray in most specimens; and eye-ring is present. Ears are dark brown, thinly covered with short, dark rusty brown hair; tail is slightly more than one-third the total length, uniformly dark, sparsely haired, and without tuft. Manus and pes are covered dorsally with short, dark ocherous hairs; and ungual tufts are present on forefeet and hindfeet. In contrasting with other species of Necromys (2n = 34), diploid number of the Northern Akodont is 2n = 18.
Habitat. Savannas and evergreen, cloud, deciduous, and premontane humid forests.
Food and Feeding. The Northern Akodont eats succulent vegetation and seeds.
Breeding. Reproduction of the Northern Akodont occurs year-round, with peak in May-June at onset of rainy season. Average littersize is five young. Sexual maturity is reached at 2:7 months old.
Activity patterns. The Northern Akodont is terrestrial and active day and night.
Movements, Home range and Social organization. In premontane humid forest of the Coastal Range in Venezuela, a 22month study found mean density of 2-9 ind/ha (range 0-6-5-9 ind/ha) and a mean residence time ofjust over three months for males and four months for females. The population was slightly female biased (1: 1-2), and estimated juvenile survivorship was 55%.
Status and Conservation. Classified as Least Concern on The IUCN Red List.
Bibliography. Aagaard (1982), Eisenberg & Redford (1999), Gémez-Laverde, Anderson et al. (2016), Handley (1976), Lim (2016), Linares (1998), O'Connell (1989), Pardinas, Teta, Ortiz et al. (2015), Reig et al. (1971), Ventura et al. (2000), Voss (1992).
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
