Ruschi's rats usually weigh between 40 and 65 grams. They are small, with a length range of 115 to 135 mm. Their tails are very long with a range of 85 to 148 mm. Males are typically larger than females in both size and weight. There is a distinguishing tuft of hair at the tip of their tails, which is unusual for rat species. Unlike most other rats, the hairs on their body are fairly spiny, with the spines becoming more prevalent as you move toward the tail. Fur color is normally brown or grey and they have short rostra. (Cerboncini, et al., 2014; Pardinas, et al., 2009)
Ruschi's rats have not been observed extensively in the wild, so there is little information on behavior. Many sigmodontine rodents are promiscuous or polygamous and will mate with any number of individuals. (Cerboncini, et al., 2014; Steinmann, et al., 2008)
Ruschi's rats have not been observed in the wild and there is little information on parental care. In general, sigmodontine rodent females care for their young exclusively through gestation and lactation and young become independent soon after weaning. (Steinmann, et al., 2008)
Longevity in Ruschi's rats is unknown at this point. Captive individuals have survived from 3 to 5 years. (Pardinas, et al., 2009)
Ruschi's rats have not been studied extensively in the wild and little is known of their behavior.
Home range in Ruschi's rats is not reported in the literature.
Ruschi's rats prefer a diet of fruits, seeds, and nuts while in captivity. Whether this reflects what they eat in the wild is unknown. (Pardinas, et al., 2009)
Ruschi's rats have a unique spiny pelage that may deter predation to some extent. No predators are reported in the literature. (Pardinas, et al., 2009)
Ruschi's rats are poorly studied and little is known of their impact on the ecosystems in which they live.
There are no known positive impacts of Ruschi's rats on humans, but little is known of their ecology and behavior.
There are no known negative impacts of Ruschi's rats on humans.
While (Pardinas, et al., 2008)lives in an area under constant threat of deforestation and has not been studied extensively in the wild. However, individuals have been found across a relatively large range. The IUCN has placed this species in the least concern category. Other conservation organizations have not given the species any recognition as it is still relatively unstudied.
Alex Popidinski (author), University of St. Francis, Tanya Dewey (author, editor), University of Michigan-Ann Arbor, William Bromer (editor), University of St. Francis.
living in the southern part of the New World. In other words, Central and South America.
uses sound to communicate
young are born in a relatively underdeveloped state; they are unable to feed or care for themselves or locomote independently for a period of time after birth/hatching. In birds, naked and helpless after hatching.
having body symmetry such that the animal can be divided in one plane into two mirror-image halves. Animals with bilateral symmetry have dorsal and ventral sides, as well as anterior and posterior ends. Synapomorphy of the Bilateria.
uses smells or other chemicals to communicate
having markings, coloration, shapes, or other features that cause an animal to be camouflaged in its natural environment; being difficult to see or otherwise detect.
animals that use metabolically generated heat to regulate body temperature independently of ambient temperature. Endothermy is a synapomorphy of the Mammalia, although it may have arisen in a (now extinct) synapsid ancestor; the fossil record does not distinguish these possibilities. Convergent in birds.
parental care is carried out by females
union of egg and spermatozoan
an animal that mainly eats fruit
an animal that mainly eats seeds
An animal that eats mainly plants or parts of plants.
offspring are produced in more than one group (litters, clutches, etc.) and across multiple seasons (or other periods hospitable to reproduction). Iteroparous animals must, by definition, survive over multiple seasons (or periodic condition changes).
having the capacity to move from one place to another.
the area in which the animal is naturally found, the region in which it is endemic.
rainforests, both temperate and tropical, are dominated by trees often forming a closed canopy with little light reaching the ground. Epiphytes and climbing plants are also abundant. Precipitation is typically not limiting, but may be somewhat seasonal.
reproduction that includes combining the genetic contribution of two individuals, a male and a female
uses touch to communicate
Living on the ground.
the region of the earth that surrounds the equator, from 23.5 degrees north to 23.5 degrees south.
uses sight to communicate
reproduction in which fertilization and development take place within the female body and the developing embryo derives nourishment from the female.
Cerboncini, R., T. Zanata, W. Cunha, A. Rorato, A. Calefi, M. Sbeghen, . Macagnan, K. Abreu, M. Ono, F. Passos. 2014. Distribution extension of Abrawayaomys ruschii Cunha and Cruz, 1979 (Rodentia: Cricetidae) with the first records in the state of Paraná, southern Brazil. Check List, 10(3): 660-662.
Hull, E., J. Dominguez. 207. SEXUAL BEHAVIOR IN MALE RODENTS. NIHPA Manuscripts, 52(1): 45-55. Accessed November 06, 2014 at http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1952538/.
Pardinas, U., P. Teta, A. Percequillo. 2008. "Abrawayaomys ruschii" (On-line). The UNCN Red List of Threatened Species. Accessed November 06, 2014 at http://www.iucnredlist.org/details/16/0.
Pardinas, U., P. Teta, G. D'Ella. 2009. Taxonomy and distribution of Abrawayaomys (Rodentia: Cricetidae), an Atlantic Forest endemic with the description of a new species. Zootaxa, 2128: 39-60.
Pereira, L., L. Geise, . Adams, R. Cerqueira. 2008. Abrawayaomys ruschii Cunha & Cross, 1979 (Rodentia, Cricetidae) in the State of Rio de Janeiro, Brazil. SciELO, 48: 5.
Poor, A. 2005. "Sigmodontinae South American rats and mice" (On-line). Animal Diversity Web. Accessed November 06, 2014 at http://animaldiversity.ummz.umich.edu/accounts/Sigmodontinae/.
Steinmann, A., J. Pritotto, J. Polop. 2008. Territorial behaviour in corn mice, Calomys musculinus (Muridae: Sigmodontinae), with regard to mating system. J Ethol, 27: 51-58. Accessed November 06, 2014 at http://voxpopuliunrc.org/ecopaisaje/archivos/2009%20Steinmann%20et%20al%202009-%20Territorial%20behaviour%20in%20corn%20mice,%20Calomys%20musculinus-J%20Ethol.pdf.
Testoni, A., S. Althoff, A. Nascimento, . Steiner-Souza, . Sbalqueiro. 2010. Description of the karyotype of Rhagomys rufescens Thomas, 1886 (Rodentia, Sigmodontinae) from Southern Brazil Atlantic forest. SciELO, 33: 3.
Tiepolo, G. 2014. "The Atlantic Forest harbors a range of biological diversity similar to that of the Amazon." (On-line). The Nature Conservancy. Accessed October 06, 2014 at http://www.nature.org/ourinitiatives/regions/southamerica/brazil/placesweprotect/atlantic-forest.xml.