Cryptonanus chacoensis 


Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Mammalia Didelphimorphia Didelphidae

Scientific Name: Cryptonanus chacoensis
Species Authority: (Tate, 1931)
Common Name(s):
English Chacoan Mouse Opossum
Gracilinanus chacoensis (Tate, 1931)
Marmosa agilis subspecies chacoensis Tate, 1931
Taxonomic Notes: In the original description was named Marmosa agilis chacoensis Tate, 1931. A new name combination and synonymy, Marmosa (Thylamys) agilis agilis, was proposed by Cabrera, 1958. Gardner and Creighton, 1989 gave a new name combination, Gracilinanus agilis. Voss et al. (2005) described a new genus, Cryptonanus, and transferred Gracilinanus agilis to this new genus, and renamed the taxon as C. chacoensis.

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2011
Date Assessed: 2011-06-30
Assessor(s): Carmignotto, A.P., de la Sancha, N., Flores, D. & Teta, P.
Reviewer(s): Martin, G.M. & Chiozza, F.
This species is listed as Least Concern in because of its wide distribution, presumed large population, occurrence in a number of protected areas, tolerance to some degree of habitat modification, and because it is unlikely to be declining at nearly the rate required to qualify for listing in a threatened category.
Previously published Red List assessments:
2008 Least Concern (LC)

Geographic Range [top]

Range Description: This species occurs in northern Argentina and Paraguay as well as in Brazil in Mato Grosso and Mato Grosso do Sul (Voss et al. 2005). The species could occur in Uruguay but has not yet been recorded.
Countries occurrence:
Argentina; Brazil; Paraguay
Lower elevation limit (metres): 50
Upper elevation limit (metres): 1800
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: There is no local estimate of its abundance but it is known from over 20 localities. It is locally rare and appears to be one of the more commonly captured species of small marsupials in Paraguay (de la Sancha in litt. 2006). There seem to be two distinct morphotypes. New specimens have been collected in the interior of primary forest remnants which are redder and considerably larger than specimens collected in open habitats. Many aspects of this species (e.g., population, intraspecific variability, ecology) are poorly known.
Current Population Trend: Stable
Additional data:
Population severely fragmented: No

Habitat and Ecology [top]

Habitat and Ecology: It inhabits seasonally flooded forests and grasslands. The species seems to be adaptable to disturbed habitats and it there is a possibility that it may be expanding in range with deforestation in the Atlantic forest of Paraguay although there are no data to substantiate this (de la Sancha in litt. 2006). It is found from 50-1,800 m (Voss et al. 2005).
Systems: Terrestrial

Threats [top]

Major Threat(s): There are not currently any major threats to the species (de la Sancha in litt. 2006).

Conservation Actions [top]

Conservation Actions: It is known from at least two protected areas in Brazil and from at least multiple protected areas in Paraguay.

Citation: Carmignotto, A.P., de la Sancha, N., Flores, D. & Teta, P. 2011. Cryptonanus chacoensis. The IUCN Red List of Threatened Species 2011: e.T136845A4346572. . Downloaded on 26 May 2016.
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