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Amazonian marsh rats are smaller than the common brown rat, but otherwise have a similar appearance.They range from 13 to 22 cm (5.1 to 8.7 in) in head-body length, with a tail 12 to 18 cm (4.7 to 7.1 in) long, and typically weigh between 130 and 200 g (4.6 and 7.1 oz).
Weighing about 40 to 80 g (1.4 to 2.8 oz), 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.
Marsh rat can refer to several not closely related types of semiaquatic rodents of superfamily Muroidea: Dasymys, about ten species from Africa in the family Muridae; African marsh rat or common dasymys (D. incomtus) Angolan marsh rat (D. nudipes) Holochilus, three species from South America in the family Cricetidae;
The southern population of the salt-marsh harvest mouse tends to have dark brown fur above and a pinkish cinnamon or tawny belly; moreover, the tail is likewise bicolored. An adult's length is 5–7 centimetres (2.0–2.8 in) and a tail length of 6–10 centimetres (2.4–3.9 in). Its height is between 1.5 and 2.1 centimetres (0.59 and 0.83 in).
Holochilus brasiliensis, also known as the Brazilian marsh rat [2] or web-footed marsh rat, [1] is a species of semiaquatic rodent from South America. It is found in northeastern Argentina , southern and eastern Brazil and in eastern Uruguay .
Lundomys molitor, also known as Lund's amphibious rat [3] or the greater marsh rat, [4] is a semiaquatic rat species from southeastern South America. Its distribution is now restricted to Uruguay and nearby Rio Grande do Sul , Brazil , but it previously ranged northward into Minas Gerais , Brazil, and southward into eastern Argentina .
South America's rodent fauna today is largely an outgrowth of two spectacularly fortunate ancient "sweepstakes" dispersal events, each of which was followed by explosive diversification. Caviomorphs, the first rodents to reach the continent, are believed to have washed ashore after rafting across the Atlantic from Africa over 30 million years ...
The most convenient distinguishing feature of the Arvicolinae is the nature of their molar teeth, which have prismatic cusps in the shape of alternating triangles. These molars are an adaptation to a herbivorous diet in which the major food plants include a large proportion of abrasive materials such as phytoliths; the teeth get worn down by abrasion throughout the adult life of the animal and ...