NATURAL HISTORY · CATALOGUE RECORD
King Arboreal Rice Rat
Oecomys rex Thomas, 1910
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.
Regal oecomys (Oecomys rex) range. Extant (resident) Probably extant (resident)
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Open encyclopedia reference
Oecomys rex, also known as the regal oecomys or king arboreal rice rat, is a species of rodent in the genus Oecomys of family Cricetidae. It is found in Guyana, Suriname, French Guiana, and nearby parts of Venezuela and Brazil.
Wikipedia contributors, Oecomys rex; see linked history · CC BY-SA 4.0 . Plain-text lead excerpt, at most 180 words; no infobox or later sections Retrieved 2026-10-05T12:31:05.319509+00:00. This reference remains separate from the taxonomic record.
Identity & source status
- Scientific name
- Oecomys rex Thomas, 1910
- Name authority
- Thomas, 1910
- Common name
- King Arboreal Rice Rat
- Rank
- species
- Accepted status
- accepted
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Mammalia
- Order
- Rodentia
- Family
- Cricetidae
- Genus
- Oecomys
- 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
- infraclassEutheria Gill, 1872
- orderRodentia Bowdich, 1821
- suborderMyomorpha Brandt, 1855
- superfamilyMuroidea Illiger, 1811
- familyCricetidae Fischer, 1817
- subfamilySigmodontinae Wagner, 1843
- genusOecomys Thomas, 1906
- speciesOecomys rex Thomas, 1910
Close classified relatives
These entries share the source’s genus, Oecomys. They are not necessarily the closest relatives established by molecular evidence.
| Species | Classification | Source status |
|---|---|---|
| Bicolored Arboreal Rice RatOecomys bicolor (Tomes, 1860) | CricetidaeChordata | Accepted speciesRecorded extant |
| Cleber's Arboreal Rice RatOecomys cleberi Locks, 1981 | CricetidaeChordata | Accepted speciesRecorded extant |
| Concolored Rice RatOecomys concolor (Wagner, 1845) | CricetidaeChordata | Accepted speciesRecorded extant |
| Mamore Arboreal Rice RatOecomys mamorae (Thomas, 1906) | CricetidaeChordata | Accepted speciesRecorded extant |
| Red Arboreal Rice RatOecomys rutilus Anthony, 1921 | CricetidaeChordata | Accepted speciesRecorded extant |
| Foothill Arboreal Rice RatOecomys superans Thomas, 1911 | CricetidaeChordata | Accepted speciesRecorded extant |
| Oecomys sydandersoni Carleton, Emmons & Musser, 2009 | CricetidaeChordata | Accepted speciesRecorded extant |
| Robert's Arboreal Rice RatOecomys roberti (Thomas, 1904) | CricetidaeChordata | Accepted speciesRecorded extant |
| Atlantic Forest OecomysOecomys catherinae Thomas, 1909 | CricetidaeChordata | Accepted speciesRecorded extant |
| Tawny OecomysOecomys flavicans (Thomas, 1894) | CricetidaeChordata | Accepted speciesRecorded extant |
| Brazilian Arboreal Rice RatOecomys paricola (Thomas, 1904) | CricetidaeChordata | Accepted speciesRecorded extant |
| Dusky Arboreal Rice RatOecomys phaeotis (Thomas, 1901) | CricetidaeChordata | Accepted speciesRecorded extant |
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=633194 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.
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:48V59. Classification follows source parent identifiers. English common names may vary by region.