|
Oryzomys
''Oryzomys'' is a genus of semiaquatic rodents in the tribe Oryzomyini living in southern North America and far northern South America. It includes eight species, two of which—the marsh rice rat (''O. palustris'') of the United States and '' O. couesi'' of Mexico and Central America—are widespread; the six others have more restricted distributions. The species have had eventful taxonomic histories, and most species were at one time included in the marsh rice rat; additional species may be recognized in the future. The name ''Oryzomys'' was established in 1857 by Spencer Fullerton Baird for the marsh rice rat and was soon applied to over a hundred species of American rodents. Subsequently, the genus gradually became more narrowly defined until its current contents were established in 2006, when ten new genera were established for species previously placed in ''Oryzomys''. Species of ''Oryzomys'' are medium-sized rats with long, coarse fur. The upperparts are gray ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oryzomys Couesi
''Oryzomys couesi'', also known as Coues's rice rat, is a semiaquatic rodent in the family Cricetidae occurring from southernmost Texas through Mexico and Central America into northwestern Colombia. It is usually found in wet habitats, such as marshes, but also lives in drier forests and shrublands. Weighing about , ''O. couesi'' is a medium-sized to large rat. The coarse fur is buff to reddish above and white to buff below. The hindfeet show some specializations for life in the water, such as reduced ungual tufts of hair around the digits. It has 56 chromosomes. There is much geographic variation in size, proportions, color, and skull features. ''Oryzomys couesi'' is active during the night and builds nests of vegetation that are suspended among reeds about above the ground. It is an excellent swimmer and dives well, but can also climb in vegetation. An omnivore, it eats both plant and animal food, including seeds and insects. It breeds throughout the year; females giv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marsh Rice Rat
The marsh rice rat (''Oryzomys palustris'') is a semiaquatic North American rodent in the family Cricetidae. It usually occurs in wetland habitats, such as swamps and salt marshes. It is found mostly in the eastern and southern United States, from New Jersey and Kansas south to Florida and northeasternmost Tamaulipas, Mexico; its range previously extended further west and north, where it may have been a commensalism, commensal in corn-cultivating communities. Weighing about , the marsh rice rat is a medium-sized rodent that resembles the common black rat, black and brown rat. The upperparts are generally gray-brown, but are reddish in many Florida populations. The feet show several specializations for life in the water. The skull is large and flattened, and is short at the front. John Bachman discovered the marsh rice rat in 1816, and it was formally described in 1837. Several subspecies have been described since the 1890s, mainly from Florida, but disagreement exists over their ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oryzomys Palustris
The marsh rice rat (''Oryzomys palustris'') is a semiaquatic North American rodent in the family Cricetidae. It usually occurs in wetland habitats, such as swamps and salt marshes. It is found mostly in the eastern and southern United States, from New Jersey and Kansas south to Florida and northeasternmost Tamaulipas, Mexico; its range previously extended further west and north, where it may have been a commensal in corn-cultivating communities. Weighing about , the marsh rice rat is a medium-sized rodent that resembles the common black and brown rat. The upperparts are generally gray-brown, but are reddish in many Florida populations. The feet show several specializations for life in the water. The skull is large and flattened, and is short at the front. John Bachman discovered the marsh rice rat in 1816, and it was formally described in 1837. Several subspecies have been described since the 1890s, mainly from Florida, but disagreement exists over their validity. The Florida Key ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marsh Rice Rat
The marsh rice rat (''Oryzomys palustris'') is a semiaquatic North American rodent in the family Cricetidae. It usually occurs in wetland habitats, such as swamps and salt marshes. It is found mostly in the eastern and southern United States, from New Jersey and Kansas south to Florida and northeasternmost Tamaulipas, Mexico; its range previously extended further west and north, where it may have been a commensalism, commensal in corn-cultivating communities. Weighing about , the marsh rice rat is a medium-sized rodent that resembles the common black rat, black and brown rat. The upperparts are generally gray-brown, but are reddish in many Florida populations. The feet show several specializations for life in the water. The skull is large and flattened, and is short at the front. John Bachman discovered the marsh rice rat in 1816, and it was formally described in 1837. Several subspecies have been described since the 1890s, mainly from Florida, but disagreement exists over their ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oryzomys Antillarum
''Oryzomys antillarum'', also known as the Jamaican rice rat, is an extinct rodent of Jamaica. A member of the genus ''Oryzomys'' within the family Cricetidae, it is similar to '' O. couesi'' of mainland Central America, from where it may have dispersed to its island during the last glacial period. ''O. antillarum'' is common in subfossil cave faunas and is also known from three specimens collected live in the 19th century. Some historical records of Jamaican rats may pertain to it. The species probably became extinct late in the 19th century, perhaps due to the introduction of the small Indian mongoose, competition with introduced rodents such as the brown rat, and habitat destruction. ''Oryzomys antillarum'' was a medium-sized rat, similar in most respects to ''Oryzomys couesi''. The head and body length was and the skull was about long. The upperparts were reddish and graded into the yellowish underparts. The tail was about as long as the head and body, sparsely h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oryzomys Peninsulae
''Oryzomys peninsulae'', also known as the Lower California rice rat, is a species of rodent from western Mexico. Restricted to the southern tip of the Baja California peninsula, it is a member of the genus ''Oryzomys'' of family Cricetidae. Only about twenty individuals, collected around 1900, are known, and subsequent destruction of its riverine habitat may have driven the species to extinction. Medium in size for its genus, it was first described as a separate species, but later lumped into other, widespread species until it was reinstated as separate in 2009. It is distinctive in fur color—grayish brown on the forequarters and reddish brown on the hindquarters—and in some dimensions of its skull, with a high braincase, robust zygomatic arches (cheekbones), and long incisive foramina (perforations of the palate between the incisors and the molars). Taxonomy ''Oryzomys peninsulae'' was first collected in 1896 and Oldfield Thomas described it in 1897 as a full species of '' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oryzomys Nelsoni
''Oryzomys nelsoni'' is an extinct rodent of María Madre Island, Nayarit, Mexico. Within the genus ''Oryzomys'' of the family Cricetidae, it may have been most closely related to the mainland species '' O. albiventer''. Since its first description in 1898, most authors have regarded it as a distinct species, but it has also been classified as a mere subspecies of the marsh rice rat (''O. palustris''). After its discovery in 1897, it has never been recorded again and it is now considered extinct; the presence of introduced black rats on María Madre may have contributed to its extinction. ''Oryzomys nelsoni'' was a large species, distinguished in particular by its long tail, robust skull, and large incisors. It was reddish to yellowish above and mostly white below. Its diet may have included plant material and small animals. Taxonomy ''Oryzomys nelsoni'' was collected by Edward William Nelson and Edward Goldman in May 1897 and never found again. Their visit for th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oryzomys Dimidiatus
''Oryzomys dimidiatus'', also known as the Nicaraguan oryzomys, Thomas's rice rat, or the Nicaraguan rice rat, is a rodent in the family Cricetidae. It is known from only three specimens, all collected in southeastern Nicaragua since 1904. Placed in ''Nectomys'' upon its discovery, it was later classified in its own subgenus of ''Oryzomys'' and finally recognized as closely related to other species now placed in ''Oryzomys'', including the marsh rice rat and '' Coues' rice rat'', which occurs in the same region. With a head and body length of 110 to 128 mm (4.3 to 5.0 in), ''Oryzomys dimidiatus'' is a medium-sized rice rat. The upperparts are gray-brown and the underparts are grayish, not buffy as in ''O. couesi''. The tail is only slightly darker above than below. All three specimens were caught near water and the species may be semiaquatic, spending some time in the water. Its conservation status is currently assessed as " Data Deficient". Taxonomy The first ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oryzomys Gorgasi
''Oryzomys gorgasi'', also known as Gorgas's oryzomysMusser and Carleton, 2005, p. 1148 or Gorgas's rice rat, is a rodent in the genus ''Oryzomys'' of family Cricetidae. First recorded in 1967, it is known from only a few localities, including a freshwater swamp in the lowlands of northwestern Colombia and a mangrove islet in northwestern Venezuela. It reportedly formerly occurred on the island of Curaçao off northwestern Venezuela; this extinct population has been described as a separate species, ''Oryzomys curasoae'', but does not differ morphologically from mainland populations. ''Oryzomys gorgasi'' is a medium-sized, brownish species with large, semiaquatically specialized feet. It differs from other ''Oryzomys'' species in several features of its skull. Its diet includes crustaceans, insects, and plant material. The species is listed as "Endangered" by the International Union for Conservation of Nature as a result of destruction of its habitat and competition with the i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oryzomys Albiventer
''Oryzomys albiventer'' is a rodent in the genus ''Oryzomys'' of family Cricetidae from interior western Mexico, in the states of Jalisco, Guanajuato, and Michoacán. First described in 1901 as a separate species, it was later lumped under '' O. couesi'' and the marsh rice rat (''O. palustris'') until it was reinstated as a species in 2009. It differs from neighboring ''Oryzomys'' populations in size and measurements and is a large, brightly colored species with a long tail and robust skull and molars. Its range has been much impacted by agricultural development, but isolated populations are thought to persist. Taxonomy ''Oryzomys albiventer'' was first described by C.H. Merriam in 1901 on the basis of ten specimens from Ameca, Jalisco.Merriam, 1901, pp. 279–280 He named the animal ''albiventer'' after the white color of its underpartsCarleton and Arroyo-Cabrales, 2009, p. 118 and considered it most closely related to ''Oryzomys aquaticus'' (currently i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oryzomyini
Oryzomyini is a tribe of rodents in the subfamily Sigmodontinae of the family Cricetidae. It includes about 120 species in about thirty genera,Weksler et al., 2006, table 1 distributed from the eastern United States to the southernmost parts of South America, including many offshore islands. It is part of the clade Oryzomyalia, which includes most of the South American Sigmodontinae. The name ''Oryzomyini'' derives from that of its type genus, ''Oryzomys'', which means "rice rat" or "rice mouse". Many species are also known as rice rats. Taxonomy Contents of Oryzomyini An oryzomyine group was first envisaged by Oldfield Thomas in the early 20th century. He defined it to include pentalophodont species, which have a mesoloph(id) on the upper and lower molars, with a long palate (extending past the third molars). Thomas included ''Oligoryzomys'', ''Oecomys'', and ''Oryzomys'' (which included many species now in other genera), as well as '' Rhagomys'', which is currently classified ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hesperomys
Vesper mice are rodents belonging to a genus ''Calomys''. They are widely distributed in South America. Some species are notable as the vectors of Argentinian hemorrhagic fever and Bolivian hemorrhagic fever. The genus was originally named ''Hesperomys'', but was changed to ''Calomys'' since 1962. History ''Hesperomys'' was introduced by George Robert Waterhouse in 1839 for the American rodents with cusps arranged in two series. The name combines the Greek ἑσπερος "west" and μυς "mouse". He considered it possible that species of ''Hesperomys'' would be found in the Old World, but did not doubt that the Americas were their chief abode. He included as species ''Mus bimaculatus'' (='' Calomys laucha''), ''Mus griseo-flavus'' (=''Graomys griseoflavus''), ''Mus Darwinii'' (=''Phyllotis darwini''), ''Mus zanthopygus'' (=''Phyllotis xanthopygus''), ''Mus galapagoensis'' (='' Aegialomys galapagoensis''), ''Symidon hispidum'' (=''Sigmodon hispidus''), ''Mus leucopus'' (=''Per ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
