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Reithrodon
''Reithrodon'' is a genus of rodent in the family Cricetidae. It contains the following living species: * Bunny rat (''Reithrodon auritus'') * Naked-soled conyrat The naked-soled conyrat (''Reithrodon typicus'') is a species of rodent in the family Cricetidae. It is an herbivore of grasslands in northern Argentina, southern Brazil, and Uruguay. Its karyotype A karyotype is the general appearance of the ... (''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. References External links Tree of Life: Reithrodon Rodent genera Taxonomy articles created by Polbot {{Sigmodontinae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bunny Rat
The bunny rat, or hairy-soled conyrat (''Reithrodon auritus'') is a species of rodent in the family Cricetidae, native to southern South America. Description The bunny rat is a heavily built rat-like rodent, with a total length of , including the tail. Adults weigh an average of about . The body is covered in long soft hair, and the tail is also hairy, ending in a distinct tuft. The head is relatively large, with prominent rounded, hairy, ears. The hind legs are unusually long for a rat, with the first and fifth toes reduced in size, giving them an appearance similar to those of a rabbit. The fur is dark brown to buff-grey over the upper parts of the body, becoming paler, sometimes almost white, on the underparts. Without genetic analysis, the bunny rat can only be reliably distinguished from its close relative, the naked-soled conyrat, by the fact that the soles of its feet are hairy. Its karyotype has 2n =34. Distribution and habitat Bunny rats are widespread in Argentina an ... [...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 The naked-soled conyrat (''Reithrodon typicus'') is a species of rodent in the family Cricetidae. It is an herbivore of grasslands in northern Argentina, southern Brazil, and Uruguay. Its karyotype A karyotype is the general appearance of the ... (''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. References External links Tree of Life: Reithrodon Rodent genera Taxonomy articles created by Polbot {{Sigmodontinae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reithrodon Typicus
The naked-soled conyrat (''Reithrodon typicus'') is a species of rodent in the family Cricetidae. It is an herbivore of grasslands in northern Argentina, southern Brazil, and Uruguay. Its karyotype A karyotype is the general appearance of the complete set of metaphase chromosomes in the cells of a species or in an individual organism, mainly including their sizes, numbers, and shapes. Karyotyping is the process by which a karyotype is disce ... has 2n = 28. References Reithrodon Mammals of Argentina Mammals of Brazil Mammals of Uruguay Mammals described in 1837 {{Sigmodontinae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pliocene
The Pliocene ( ; also Pleiocene) is the epoch in the geologic time scale that extends from 5.333 million to 2.58See the 2014 version of the ICS geologic time scale million years ago. It is the second and most recent epoch of the Period in the Cenozoic Era. The Pliocene follows the Miocene Epoch and is followed by the Pleistocene Epoch. Prior to the 2009 revision of the geologic time scale, which placed the fou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rodent
Rodents (from Latin , 'to gnaw') are mammals of the Order (biology), 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 Mouse, mice, rats, squirrels, prairie dogs, porcupines, beavers, guinea pigs, and hamsters. Rabbits, hares, and ... [...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, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Incisor
Incisors (from Latin ''incidere'', "to cut") are the front teeth present in most mammals. They are located in the premaxilla above and on the mandible below. Humans have a total of eight (two on each side, top and bottom). Opossums have 18, whereas armadillos have none. Structure Adult humans normally have eight incisors, two of each type. The types of incisor are: * maxillary central incisor (upper jaw, closest to the center of the lips) * maxillary lateral incisor (upper jaw, beside the maxillary central incisor) * mandibular central incisor (lower jaw, closest to the center of the lips) * mandibular lateral incisor (lower jaw, beside the mandibular central incisor) Children with a full set of deciduous teeth (primary teeth) also have eight incisors, named the same way as in permanent teeth. Young children may have from zero to eight incisors depending on the stage of their tooth eruption and tooth development. Typically, the mandibular central incisors erupt first, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Miocene
The Miocene ( ) is the first 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 means "less recent" because it has 18% fewer modern marine invertebrates than the Pliocene has. The Miocene is preceded by the Oligocene and is followed by the Pliocene. As Earth went from the Oligocene through the Miocene and into the Pliocene, the climate slowly cooled towards a series of ice ages. The Miocene boundaries are not marked by a single distinct global event but consist rather of regionally defined boundaries between the warmer Oligocene and the cooler Pliocene Epoch. During the Early Miocene, the Arabian Peninsula collided with Eurasia, severing the connection between the Mediterranean and Indian Ocean, and allowing a faunal interchange to occur between Eurasia and Africa, including the dispersal of proboscideans into Eurasia. During the la ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rodent Genera
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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
