They are born naked and blind, weighing approximately 3 g each. Muroid rodents. The second and third lowers molars have two large roots, one at the front and one at the back. Extensive land drainage practices in southern Texas have limited the range of the rice rat population in the United States. [149] The interparietal bone is narrow and wedge-shaped, so that the parietal and squamosal bones meet extensively. They are good at swimming and diving, and move their tails back and forth when they swim. Schmidly, D.J.
(Fuentes-Montemayor, et al., 2009). [109] In 1937, Bole described another species of Panamanian Oryzomys, Oryzomys azuerensis from Paracoté, Veraguas Province.
[107], Oryzomys is rare in Panama. Eyes are opened on the fifth or sixth day and they are weaned on the eleventh day. [143] The zygomatic plate, the flattened front part of the zygomatic arch, is broad and develops a notch at its front end. Additional support has come from the Marisla Foundation, UM College of Literature, Science, and the Arts, Museum of Zoology, and Information and Technology Services. Unexpected high levels of genetic variability and the population structure of an island endemic rodent (Oryzomys couesi cozumelae). The skull is light and thin with a maximum length of 30.5 mm, zygomatic breadth of 16 mm, interorbital breadth of 4.8 mm, and nasals are 11.9 mm apart. Both sexes reach sexual maturity after 40 to 45 days.
associates with others of its species; forms social groups. Merriam, C. 1901. Synopsis of the rice rats (genus Oryzomys) of the United States and Mexico. [24] The Cytb data placed all studied specimens of O. couesi in a clade sister to the marsh rice rat; the mean genetic distance between the two groups was 11.30%,[25] much larger than the distance between sister species in the related genera Melanomys and Nectomys (7.48% and 7.52%, respectively). Wolfe, J.
These studies said that they eat about the same amount of plant and animal foods. [126], The introduced snake Boa constrictor preys on O. couesi on Cozumel. 2005. [192] The mites Eubrachylaelaps circularis and Gigantolaelaps boneti have been found on Oryzomys couesi in Oaxaca,[193] the sucking louse Hoplopleura oryzomydis in Nicaragua,[194] the mites Laelaps oryzomydis, Echinonyssus microchelae, Ornithonyssus bacoti, Prolistrophorus frontalis, and Prolistrophorus bakeri in Colima,[195] and the apicomplexan Eimeria couesii in Mexico.
and Bradley, R.D. [142], The nasal and premaxillary bones do not extend back beyond the point where the lacrimal, frontal, and maxillary bones meet. 2007.
Oryzomys palustris. [29], Populations of Oryzomys couesi from Jalisco, western Mexico, east to El Salvador form a single Cytb clade, which Hanson and colleagues proposed to recognize as the species Oryzomys mexicanus. 894–1531 in Wilson, D.E. This material is based upon work supported by the [190] It probably breeds around the year and after a pregnancy of 21 to 28 days,[126] the female produces litters of two to seven young, with an average of 3.8, according to Reid's Mammals of Central America & Southeast Mexico. Habitat use and demographic characteristics of the west Mexican cotton rat (Sigmodon mascotensis). It breeds throughout the year; females give birth to about four young after a pregnancy of 21 to 28 days. Nevertheless, O. couesi as currently constituted is likely a composite of several species; a 2010 study, using DNA sequence data, found evidence to recognize separate species from the Pacific and eastern sides of the distribution of O. couesi and two additional species from Panama and Costa Rica. Pp.
Females give birth to 2 to 7 young at a time, and usually around 4. First South American record of Coues' marsh rice rat, The glans penis in Neotropical cricetines (Family Muridae) with comments on classification of muroid rodents, Mammals from Isla Cozumel, México, with description of a new species of harvest mouse, The zoogeographical limits of the West Indies, Six new mammals from Cozumel Island, Yucatan, Catacamas virus, a hantaviral species naturally associated with, Mammals from Guatemala and British Honduras, Mammal Species of the World: a taxonomic and geographic reference.
[28] Using the genetic species concept, the authors suggested that the four groups they found within O. couesi should be recognized as distinct species. Similar to other species of rice rats (Oryzomys), Coues' rice rats most likely rely on vision, hearing, taste, and smell in order to perceive and communicate in their environment. The hindfeet show some specializations for life in the water, such as reduced ungual tufts of hair around the digits. [52] Three of those (albiventer from Jalisco,[53] crinitus from the Distrito Federal,[50] and aztecus from Morelos)[49] were described by Merriam in 1901, and Goldman had himself described regillus from Michoacán in 1915. texensis). [156] The squamosal lacks a suspensory process that contacts the tegmen tympani, the roof of the tympanic cavity, a defining character of oryzomyines. and Miller, C.M. Taxon Information This material is based upon work supported by the 2009. It usually lives below 1000 m (3300 ft) altitude, but has been found at 1525 m (5000 ft) in Jalisco. Later scientific studies reported that their diet changes depending on the season. 2009. Superfamily Muroidea. National Science Foundation
1989. Cook, W., R. Timm, D. Hyman. couesi. [124] The young become reproductively active when seven weeks old and the life cycle is short. [160] The capsular process, a raising of the bone of the back of the mandible that houses the back end of the incisor, is large. The snout ends bluntly and the moderately large eyes show reddish eyeshine.
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