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Opisthodont Jaws
In rodents, incisor procumbency refers to the orientation of the upper incisor, defined by the position of the cutting edge of the incisor relative to the vertical plane of the incisors. Proodont incisors have the cutting edge in front of the vertical plane, orthodont teeth have it perpendicular to the plane, opisthodont incisors have it behind the plane, and hyper-opisthodont teeth have the cutting edge even behind the back of the alveolus of the incisor. Phyllotini are mostly opisthodont, but '' Auliscomys'' and '' Galenomys'' are orthodont and have sometimes even been described as proodont, and ''Eligmodontia'', '' Loxodontomys'', and some species of ''Calomys'' are hyper-opisthodont. ''Irenomys'', ''Reithrodon'', and '' Neotomys'', formerly classified as phyllotines, are also hyper-opisthodont.Steppan, 1995, p. 18 Oryzomyini are also mostly opisthodont, but ''Amphinectomys savamis'', ''Handleyomys fuscatus'', '' Melanomys caliginosus'', ''Mindomys hammondi'', ''Scolomys m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mindomys Hammondi
''Mindomys'' is a genus of sigmodontine rodents in the family Cricetidae. It includes two species known only from Ecuador, Hammond's rice rat ''Mindomys hammondi'', also known as Hammond's rice rat or Hammond's oryzomys,Musser and Carleton, 2005, p. 1149 is an endangered species of rodent in the tribe Oryzomyini of family Cricetidae. Formerly considered to be related with ''Nect ... (''Mindomys hammondi'') and the Kutukú rat (''Mindomys kutuku''). See also * List of mammals of Ecuador References Oryzomyini Rodent genera Endemic fauna of Ecuador Mammals of Ecuador {{Sigmodontinae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Irenomys
''Irenomys tarsalis'', also known as the Chilean climbing mouse, Chilean tree mouse, or long-footed irenomys,Musser and Carleton, 2005, p. 1121 is a rodent found in Chile, from about 36° to 46°S, and in adjacent Argentina, mainly in forests. It is a large, long-tailed, soft-furred mouse characterized by grooved upper incisors and specialized molars with transverse ridges, divided by deep valleys, which are connected by a transverse ridge along the midline of the molars. ''I. tarsalis'' is a docile, herbivorous animal that lives in trees. It is so distinct from other species that it was placed in its own genus, ''Irenomys'', in 1919. The name comes from the Ancient Greek word εἰρήνη (''iren'') meaning "peace", in reference to the end of World War I. Although it has been generally placed in the tribe Phyllotini, genetic evidence does not support any close relationships with other genera, so that it is now classified as a member of the subfamily Sigmodontinae ''incertae s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scolomys Melanops
''Scolomys melanops'', also known as the short-nosed scolomys, South American spiny mouse, Ecuadorian spiny mouse, or gray spiny mouse, is a species of rodent in the genus ''Scolomys'' of family Cricetidae. It is a forest mouse and was thought to be endemic to Ecuador but it is now known to have a wider distribution, being also present in part of Peru. Description The South American spiny mouse has a total length of between including a tail of . It has a short, broad head, a small body and a nearly naked tail. The dorsal pelage is short and dense and consists of a mixture of slender hairs with reddish or blackish tips and stouter spines of the same length that are darker at the tip, giving a grizzled appearance. The fur on the ventral surface has similar hairs and spines but they are a uniform grey colour. Morphologically this species is very similar to the closely related Ucayali spiny mouse (''Scolomys ucayalensis''). The differences are mostly in the skull characteristics and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Melanomys Caliginosus
''Melanomys caliginosus'', also known as the dusky melanomysMusser and Carleton, 2005 or dusky rice rat, is a species of rodent in the genus '' Melanomys'' of family Cricetidae. It is found from Central America, in Honduras, Nicaragua, Costa Rica, and Panama, into South America, where it occurs in Venezuela, Colombia, and Ecuador Ecuador ( ; ; Quechua: ''Ikwayur''; Shuar: ''Ecuador'' or ''Ekuatur''), officially the Republic of Ecuador ( es, República del Ecuador, which literally translates as "Republic of the Equator"; Quechua: ''Ikwadur Ripuwlika''; Shuar: ''Eku .... Populations currently classified under ''M. caliginosus'' may in fact include more than one species. References Literature cited *Anderson, R.P., Gómez-Laverde, M. and Timm, R. 2008. '. In IUCN. IUCN Red List of Threatened Species. Version 2009.2.www.iucnredlist.org. Downloaded on November 15, 2009. *Musser, G.G. and Carleton, M.D. 2005. Superfamily Muroidea. Pp. 894–1531 in Wilson, D.E. and Ree ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Handleyomys Fuscatus
''Handleyomys fuscatus'', also known as the dusky-footed Handley's mouseMusser, G. G. and M. D. Carleton. 2005. Superfamily Muroidea. pp. 894–1531 ''in'' Mammal Species of the World a Taxonomic and Geographic Reference. D. E. Wilson and D. M. Reeder eds. Johns Hopkins University Press, Baltimore. or dusky-footed montane mouse, is a species of rodent in the tribe Oryzomyini of family Cricetidae. It was previously placed in the genus ''Aepeomys'', but it is closely similar to ''Handleyomys intectus The Colombian rice rat (''Handleyomys intectus''), also known as the white-footed Handley's mouse is a species of rodent in the family Cricetidae occurring only in Colombia. It was previously included in ''Oryzomys'', but closely resembles the ...'' (previously ''Oryzomys intectus''), and accordingly both species were placed in the new genus ''Handleyomys'' in 2002. It is found only in Colombia. References Further reading * Handleyomys Endemic fauna of Colombia Mam ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amphinectomys Savamis
''Amphinectomys savamis'', also known as the Ucayali water ratMusser and Carleton, 2005 or amphibious rat,Duff and Lawson, 2004 is a rodent from the Peruvian Amazon. It is placed as the only member of genus ''Amphinectomys'' in the tribe Oryzomyini of family Cricetidae. It is similar to ''Nectomys ''Nectomys'' is a genus of rodent in the tribe Oryzomyini of family Cricetidae. Musser and Carleton, 2005. It is closely related to '' Amphinectomys'' and was formerly considered congeneric with ''Sigmodontomys''. It consists of five species, whic ...'', but its discoverers considered it to be different enough (with more expansive interdigital webbing and a significantly broader interorbital region) to require its own genus. When it was described as a new genus in 1994, knowledge of the variation within ''Nectomys'' was much more limited than it is now, and it has been suggested that the status of the taxon be re-examined considering this new information. The species's karyotype, 2n = 5 ... [...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] |
Reithrodon
''Reithrodon'' is a genus of rodent in the family Cricetidae. It contains the following living species: * Bunny rat (''Reithrodon auritus'') * Naked-soled conyrat (''Reithrodon typicus'') The scientific name translates as "channel tooth" and refers to grooves on the upper incisors. The oldest fossils date from the late Pliocene, about four million years ago. The immediate ancestors of the genus may have evolved as the southern regions of South America became increasingly arid around the end of the Miocene The Miocene ( ) is the first epoch (geology), geological epoch of the Neogene Period and extends from about (Ma). The Miocene was named by Scottish geologist Charles Lyell; the name comes from the Greek words (', "less") and (', "new") and mea .... References External links Tree of Life: Reithrodon Rodent genera Taxonomy articles created by Polbot {{Sigmodontinae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Calomys
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'' (=''Pero ... [...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] |
Loxodontomys
''Loxodontomys'' is a genus of South American rodents in the tribe Phyllotini of family Cricetidae. Two species are known, found in Argentina and Chile Chile, officially the Republic of Chile, is a country in the western part of South America. It is the southernmost country in the world, and the closest to Antarctica, occupying a long and narrow strip of land between the Andes to the east a .... They are as follows: * Southern big-eared mouse (''Loxodontomys micropus'') * Pikumche pericote (''Loxodontomys pikumche'') References Rodent genera {{Sigmodontinae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
