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Sphenopalatine Vacuities
In rodents, sphenopalatine vacuities are perforations of the roof of the mesopterygoid fossa, the open space behind the palate, in between the parapterygoid fossae. They may perforate the presphenoid or basisphenoid bone. Their development and form are variable between and within species, and features of the sphenopalatine vacuities have been used as characters in cladistic analyses.Weksler, 2006, p. 37; Steppan, 1995, pp. 37–38; Carleton, 1980, p. 44 Among Oryzomyini, a mainly South American group, a 2006 study distinguished three character states—large, wide vacuities, as among others in ''Oligoryzomys'' and ''Holochilus''; small, narrow vacuities, as among others in ''Lundomys'' and ''Nephelomys''; and no or vestigial vacuities, as among others in ''Mindomys'' and ''Oryzomys''.Weksler, 2006, p. 37 Phyllotini all have very large sphenopalatine vacuities, as does ''Sigmodon''. The vacuities in ''Reithrodon'', formerly considered a phyllotine, are especi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rodent
Rodents (from Latin , 'to gnaw') are mammals of the order Rodentia (), which are characterized by a single pair of continuously growing incisors in each of the upper and lower jaws. About 40% of all mammal species are rodents. They are native to all major land masses except for New Zealand, Antarctica, and several oceanic islands, though they have subsequently been introduced to most of these land masses by human activity. Rodents are extremely diverse in their ecology and lifestyles and can be found in almost every terrestrial habitat, including human-made environments. Species can be arboreal, fossorial (burrowing), saltatorial/richochetal (leaping on their hind legs), or semiaquatic. However, all rodents share several morphological features, including having only a single upper and lower pair of ever-growing incisors. Well-known rodents include mice, rats, squirrels, prairie dogs, porcupines, beavers, guinea pigs, and hamsters. Rabbits, hares, and pikas, whose i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mindomys
''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] |
Sciurini
Sciurini is a tribe (taxonomy), tribe that includes about forty species of squirrels,Thorington and Hoffmann, 2005, p. 754 mostly from the Americas. It includes five living genera—the American dwarf squirrels, ''Microsciurus''; the Bornean ''Rheithrosciurus''; the widespread American and Eurasian tree squirrels of the genus ''Sciurus'', which includes some of the best known squirrel species; the Central American ''Syntheosciurus''; and the American pine squirrels, ''Pine squirrel, Tamiasciurus''. Like other arboreal squirrels, they are sometimes referred to as tree squirrels. Taxonomy The name "Sciurini" was first employed by Hermann Burmeister in 1854, who used it for the entire squirrel family. In his influential 1945 classification of mammals, George Gaylord Simpson included four genus, genera of squirrels in Sciurini, which he recognized as one of eight tribe (taxonomy), tribes within the subfamily Sciurinae (including all squirrels except the flying squirrels): ''Sciuru ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neotominae
The Neotominae are a subfamily of the family Cricetidae. They consist of four tribes, 16 genera, and many species of New World rats and mice, predominantly found in North America. Among them are the well-known deer mice, white-footed mice, packrats, and grasshopper mice. Neotomines are related to the other two subfamilies of mice in the New World, the Sigmodontinae and Tylomyinae. Many authorities place them all in a single subfamily, Sigmodontinae. Taxonomy *SUBFAMILY NEOTOMINAE **Tribe Baiomyini ***Genus ''Baiomys'' - pygmy mice **** Southern pygmy mouse, ''Baiomys musculus'' **** Northern pygmy mouse, ''Baiomys taylori'' ***Genus ''Scotinomys'' - brown mice **** Alston's brown mouse, ''Scotinomys teguina'' **** Chiriqui brown mouse, ''Scotinomys xerampelinus'' **Tribe Neotomini ***Genus ''Neotoma'' - pack rats ****Subgenus ''Neotoma'' *****White-throated woodrat, ''Neotoma albigula'' ***** Tamaulipan woodrat, ''Neotoma angustapalata'' *****† Anthony's woodrat, ''Neotoma a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cricetidae
The Cricetidae are a family of rodents in the large and complex superfamily Muroidea. It includes true hamsters, voles, lemmings, muskrats, and New World rats and mice. At almost 608 species, it is the second-largest family of mammals, and has members throughout the Americas, Europe and Asia. Characteristics The cricetids are small mammals, ranging from just in length and in weight in the New World pygmy mouse up to and in the muskrat. The length of their tails varies greatly in relation to their bodies, and they may be either furred or sparsely haired. The fur of most species is brownish in colour, often with a white underbelly, but many other patterns exist, especially in the cricetine and arvicoline subfamilies. Like the Old World mice, cricetids are adapted to a wide range of habitats, from the high Arctic to tropical rainforests and hot deserts. Some are arboreal, with long balancing tails and other adaptations for climbing, while others are semiaquatic, with w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Character Polarity
Character or Characters may refer to: Arts, entertainment, and media Literature * ''Character'' (novel), a 1936 Dutch novel by Ferdinand Bordewijk * ''Characters'' (Theophrastus), a classical Greek set of character sketches attributed to Theophrastus Music * ''Characters'' (John Abercrombie album), 1977 * ''Character'' (Dark Tranquillity album), 2005 * ''Character'' (Julia Kent album), 2013 * ''Character'' (Rachael Sage album), 2020 * ''Characters'' (Stevie Wonder album), 1987 Types of entity * Character (arts), an agent within a work of art, including literature, drama, cinema, opera, etc. * Character sketch or character, a literary description of a character type * Game character (other), various types of characters in a video game or role playing game ** Player character, as above but who is controlled or whose actions are directly chosen by a player ** Non-player character, as above but not player-controlled, frequently abbreviated as NPC Other uses in art ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nyctomys
Sumichrast's vesper rat (''Nyctomys sumichrasti'') is a rodent of the family Cricetidae found from southern Mexico to Panama. It is named for the collector of the first specimen, and its closest relative is probably Hatt's vesper rat, a similar, but slightly smaller, species from the Yucatán Peninsula. Description Sumichrast's vesper rat is a relatively small rat, with an adult length of , not including the tail, which is only slightly shorter. Males and females are of similar size, with both weighing between . It is one of the more brightly coloured rats, with a reddish or orange back and creamy to white underparts. The rats have a thick pelt of soft fur, which extends over the entire length of the tail, and is absent only on the soles of the feet. The eyes are relatively large, and surrounded by a narrow ring of black hair, while the whiskers are long and the ears small. To aid in climbing, the claws are compressed and curved, and the first toe on each foot is thumb-like. Dis ... [...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] |
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] |
Nephelomys
''Nephelomys'' is a genus of South American oryzomyine rodents found in the Andes from Bolivia to Venezuela, with a westward extension into the mountains of Costa Rica. Its generic name is derived from the Ancient Greek word ''nephelê'' "mist", referring to the cloud forest habitat of the members of the genus. The species in this genus have historically been placed in ''Oryzomys'', but in 2006, Brazilian zoologist Marcelo Weksler and coworkers described it as a separate genus, because it is not closely related to the type species of ''Oryzomys''.Weksler, 2006 They are most closely related to other members of clade B, including ''Euryoryzomys'', ''Transandinomys'', '' Hylaeamys'', '' Oecomys'', and ''Handleyomys'', with some weak evidence supporting a sister-group relationship to ''Transandinomys''.Weksler et al., 2006, p. 20 ''Oryzomys'' appears in a different part of the oryzomyine evolutionary radiation, perhaps close to ''Holochilus'' and related genera. ''Nephelomys'' spec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
