Overview

Brief Summary

Biology

Short-tailed opossums live mainly on the ground, being less well adapted for climbing than other opossums (5) (7). Thought to be most active at dusk and dawn (1) (4), the shrewish short-tailed opossum feeds mainly on insects, although it will also take some fruits and small vertebrates (8). Like other opossums, it is likely to be a solitary animal (5). Although little information is available on the breeding behaviour of this species (6), it is likely that, as in other Monodelphis species, breeding occurs throughout the year (7). As is typical in marsupials, the young are born early and poorly developed, with most development taking place after birth, during a prolonged lactation period (5). Unlike many marsupials, the female shrewish short-tailed opossum does not possess a pouch to protect the young as they develop (2) (5) (6). Instead, the young cling to the mother's mammae (nipples), and later on may ride on her back and flanks (7). Interestingly, the female shrewish short-tailed opossum has the largest number of mammae of any mammal (up to 27). This, together with the extreme sexual dimorphism and the high number of immature individuals that have been collected, suggests that the species is semelparous, meaning it breeds only once, producing a single, large litter of offspring, and then dies, possibly all within its first year of life (3).
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Description

A small and rather dull-coloured opossum (2), the shrewish short-tailed opossum is aptly named after its shrew-like appearance, but is in fact a marsupial. Like other short-tailed opossums, the species has small, rounded ears, relatively small eyes, a long, pointed nose, and a tail which is about half as long as the body (3) (4) (5). The head, neck and forequarters of the shrewish short-tailed opossum are grey, with a dark brown back and reddish rump, and the cheeks and the sides of the body are reddish, contrasting with creamy-yellow to pale reddish underparts. The fur is short and smooth, and the tail is only thinly haired. The feet are reddish in colour (2) (3) (4) (6). The shrewish short-tailed opossum shows great sexual dimorphism in size, with the male being up to 50 percent larger than the female (6). The shrewish short-tailed opossum was originally described on the basis of young specimens, with the adults often being referred to as a separate species, Monodelphis henseli (6). The adult is also often confused with the yellow-sided or southern short-tailed opossum, Monodelphis dimidiata, but can be distinguished by its reddish rather than white or buffy feet, its shorter fur, and reddish rather than tawny yellow sides, and by its preference for forest rather than grassland habitats (2) (6).
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Distribution

Range

The shrewish short-tailed opossum occurs in southeastern Brazil, from Minas Gerais to Rio Grande do Sul, in southern Paraguay to Misiones province, and in northeastern Argentina (2) (3) (4) (7).
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Physical Description

Type Information

Lectotype for Monodelphis sorex
Catalog Number: USNM 461068
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Mammals
Sex/Stage: Male;
Preparation: Skull; Remainder in Fluid
Collector(s): Zikan
Year Collected: 1936
Locality: Itatiaya, Campo Bello, Rio de Janeiro, Brazil, South America
  • Lectotype: Miranda-Ribeiro, A. 1936 Jun 20. Revista Do Museu Paulista. 20: 421.
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Ecology

Habitat

The shrewish short-tailed opossum is endemic to humid rainforest within South America's coastal Atlantic Forest region (1) (2) (6).
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Conservation

Conservation Status

Status

Classified as Least Concern (LC) on the IUCN Red List (1).
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Threats

The shrewish short-tailed opossum is in need of more thorough population surveys, but is believed to be undergoing a decline as a result of habitat destruction (1) (6). The Atlantic Forest is one of the world's most seriously threatened habitats, with less than 10 percent of the original forest area now remaining. Threats to this unique region include plantations, logging and urban expansion, and much of the remaining forest is highly fragmented (6) (9).
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Management

Conservation

The shrewish short-tailed opossum is currently listed as Least Concern on the IUCN Red List, and occurs in a number of protected areas (1), such as Serra dos Órgãos National Park and Serra do Itajaí National Park in Brazil (10) (11). However, it is still a relatively little-known species, and in need of more research. No specific conservation measures are known to be in place for the shrewish short-tailed opossum, and many of the remaining fragments of its Atlantic Forest home are still in need of protection. However, despite the many threats facing this habitat, a range of conservation efforts are now underway in the region (9), and, if successful, these could help secure a brighter future for this diminutive marsupial.
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Wikipedia

Southern red-sided opossum

The Southern Red-sided Opossum, Monodelphis sorex, is an opossum species from South America. It is found in Argentina, Brazil and Paraguay.

This opossum has small rounded ears, a long pointed nose and a tail which is half as long as its body. The head, neck and foreparts are grey, the back is dark brown and the rump is reddish. It has short fur and the males are larger than the females. It is terrestrial and mainly feeds on insects, although it will also eat small vertebrates and fruit. Unlike most marsupials, the female has no pouch for the developing young. They cling to the mother’s nipples and when they are older, ride on her back and flanks.[3]

It is also called the Shrewish Short-tailed Opossum, or Dwarf Short-tailed Opossum.[4]

References

  1. ^ Gardner, A. (2005). Wilson, D. E.; Reeder, D. M. eds. Mammal Species of the World (3rd ed.). Johns Hopkins University Press. pp. 15. ISBN 978-0-8018-8221-0. OCLC 62265494. http://www.bucknell.edu/msw3.
  2. ^ Vieira, E., Astua de Moraes, D. & Brito, D. (2008). Monodelphis sorex. In: IUCN 2008. IUCN Red List of Threatened Species. Retrieved 28 December 2008. Database entry includes justification for why this species is of least concern
  3. ^ ARKive.org
  4. ^ http://www.knowyoursto.com/didelphidae/monodelphis.html#monodelphis_sorex
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