NATURAL HISTORY · CATALOGUE RECORD
Chacoan Mouse Opossum
Cryptonanus chacoensis (Tate, 1931)
Source-backed taxonomic record
Accepted species in Catalogue of Life’s 11 September 2026 base release. This preserves the source classification and available supporting data; it is not a completed species monograph.
Open encyclopedia reference
The chacoan gracile opossum (Cryptonanus chacoensis) is a species of opossum in the family Didelphidae. It is native to Argentina, Brazil and Paraguay. Its habitat is seasonally flooded grasslands and forests in and near the Gran Chaco.
The red-bellied gracile opossum (Cryptonanus ignitus), previously thought to have been extinct since 1962, has since been reevaluated as synonymous with the chacoan gracile opossum, as several specimens of C. chacoensis have been discovered that display similar coloration to C. ignitus.
Wikipedia contributors, Chacoan gracile opossum; see linked history · CC BY-SA 4.0 . Plain-text lead excerpt, at most 180 words; no infobox or later sections Retrieved 2026-10-05T09:07:21.594297+00:00. This reference remains separate from the taxonomic record.
Identity & source status
- Scientific name
- Cryptonanus chacoensis (Tate, 1931)
- Name authority
- (Tate, 1931)
- Common name
- Chacoan Mouse Opossum
- Rank
- species
- Accepted status
- accepted
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Mammalia
- Order
- Didelphimorphia
- Family
- Didelphidae
- Genus
- Cryptonanus
- Extinction status
- Recorded extant
Classification family tree
Nested taxonomic groups from the source. This is not a direct-ancestor chain, a dated evolutionary tree or a phylogenetic reconstruction.
- domainEukaryota (Chatton, 1925) Whittaker & Margulis, 1978
- kingdomAnimalia
- phylumChordata
- subphylumVertebrata
- infraphylumGnathostomata
- parvphylumOsteichthyes
- megaclassTetrapoda
- classMammalia Linnaeus, 1758
- subclassTheria Parker & Haswell, 1897
- infraclassMetatheria Huxley, 1880
- orderDidelphimorphia Gill, 1872
- familyDidelphidae Gray, 1821
- subfamilyDidelphinae Gray, 1821
- tribeThylamyini Hershkovitz, 1992
- genusCryptonanus Voss, Lunde & Jansa, 2005
- speciesCryptonanus chacoensis (Tate, 1931)
Close classified relatives
These entries share the source’s genus, Cryptonanus. They are not necessarily the closest relatives established by molecular evidence.
| Species | Classification | Source status |
|---|---|---|
| Unduavi Mouse OpossumCryptonanus unduaviensis (Tate, 1931) | DidelphidaeChordata | Accepted speciesRecorded extant |
Names & synonyms
Names explicitly linked to this accepted taxon in the source. Synonymy can change with revision.
| Recorded name | Source status |
|---|---|
| Marmosa agilis chacoensis Tate, 1931 Tate, 1931 | synonym |
| Gracilinanus ignitus Díaz, Flores & Barquez, 2002 Díaz, Flores & Barquez, 2002 | synonym |
Documented distribution
Source distribution statements, not a complete range map. A listed locality is not necessarily a place of origin.
Source literature & publication evidence
References attached to this source record, including nomenclatural citations where supplied. This is a selected bibliography; abbreviated citations remain in the source’s form.
- https://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=1255438 Source fields: Taxon.tsv dwc:namePublishedIn, Taxon.tsv dcterms:references
Origins, evidence & remaining research
Name authority and publication references document nomenclature where the source supplies it. They do not establish evolutionary origins or the earliest fossil occurrence.
Specimen-level evidence, morphology, ecological research, phylogenetic studies, a comprehensive bibliography and a located literary passage have not yet been compiled for this record. A suitable sourced image remains to be added.
Dataset citation & attribution
This exact taxon in ChecklistBank · Catalogue of Life 2026-09-11
Catalogue of Life 2026-09-11; dataset 316321; doi:10.48580/dgz5n. https://creativecommons.org/licenses/by/4.0/ . Retrieved 5 October 2026.
Stable key: col:KSRGP. Classification follows source parent identifiers. English common names may vary by region.