Childs, H.E., Jr. and Cosgrove, G.E. The marsh rice rat is active during the night, makes nests of sedge and grass, and occasionally builds runways. This species is now most commonly found in coastal marshes (an environment similar to inundated rice fields) and also occurs in forest clearings of grass and scrub as well as wet meadows in foothills of the Appalachian Mountains. It is infected by many different parasites and harbors a hantavirus that also infects humans. Possible relationships of major oryzomyine clades. 2nd edition. Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree.... Get exclusive access to content from our 1768 First Edition with your subscription. [198], A semiaquatic North American rodent in the family Cricetidae, Skulls of the marsh rice rat, seen from above (top row) and below (bottom row), at the left is a South Carolina specimen of. 2006. The ears are about the same color as the upperparts, but a patch of light hairs is in front of them. Two new rice rats (Genus. [1] The Florida Keys form is rare and in decline and is threatened by competition with the black rat, predation by domestic cats, habitat loss, and loss of genetic variation; it is considered endangered. [170], Animals that are important to the marsh rice rat's diet include insects, fiddler crabs, and snails, but the species is known to eat many other animals, including fish, clams, and juvenile Graptemys and Chrysemys turtles.

1988. 2004. The second and third lowers molars have either two roots, one labial and one lingual, or only one at the front, and another large root at the back. The second lower molar is elongated and has a crest, the anterolophid, before the two cusps that form the front edge of the molar in some other oryzomyines, the protoconid and metaconid. III, Mammals: General report upon the zoology of the several Pacific railroad routes, The land mammals of peninsular Florida and the coast region of Georgia, Effect of stannous fluoride and iodine on root caries and bone loss in rats, Ecological and taxonomic notes on the rice rat (, Getting warmer: Effect of global climate change on distribution of rodents in Texas, Systematic studies of oryzomyine rodents (Muridae, Sigmodontinae): a synopsis of, Effects of a flood on relative abundance and diversity of small mammals in a regenerating bottomland hardwood forest, A study of pathological conditions in wild rodents in radioactive areas, Genetic characterization and phylogeny of a hantavirus from Western Mexico, Effect of dietary vitamin E supplement and rotational stress on alveolar bone loss in rice rats, The Good Creek Formation, Pleistocene of Texas, and its fauna, New Pleistocene formation and local fauna from Hardeman County, Texas, Food availability and photoperiod affect reproductive development and maintenance in the marsh rice rat (, A checklist of mammals of the North American continent, the West Indies and the neighboring seas, Habitat associations of the marsh rice rat (. [82] The central digit is notably larger than those at the sides. They included twelve genera and proposed five synapomorphies for the tribe: presence of a pair of mammae on the chest; a long palate marked by posterolateral palatal pits, perforations near the third molar; absence of an alisphenoid strut, which in some sigmodontines separates two foramina (openings) in the skull; absence of a suspensory process of the squamosal bone attached to the roof of the tympanic cavity, the tegmen tympani; and absence of a gall bladder.

[129] The northernmost records in the interior United States are in eastern Oklahoma, southeastern Kansas, southern Missouri and Illinois, and the southern half of Kentucky, but the species is absent in much of the Appalachians.

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