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NATURAL HISTORY · CATALOGUE RECORD

Oecomys sydandersoni Carleton, Emmons & Musser, 2009

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.

Map of South America showing the distributions of Oecomys concolor (in green), Oecomys sydandersoni (in red), Oecomys mamorae (in dark blue), and Oecomys close to O. mamorae (in light blue).

Map of South America showing the distributions of Oecomys concolor (in green), Oecomys sydandersoni (in red), Oecomys mamorae (in dark blue), and Oecomys close to O. mamorae (in light blue).

Southamerica_blank.svg: canislupusarctos derivative work: Ucucha (talk) · CC BY-SA 3.0 · Image source

Provider-generated thumbnail requested at 800 pixels; no local editing Local WebP display rendition; resized without cropping.

Open encyclopedia reference

Oecomys sydandersoni is an arboreal species of rodent in the genus Oecomys. It lives in forest patches in a small area in eastern Bolivia. It is a medium-sized species, weighing about 45 g (1.6 oz), with mostly grayish and brownish fur and short and broad hindfeet with well-developed pads.

First collected in 1964, it was formally described in 2009. The species may be most closely related to O. concolor and O. mamorae, which are distributed further north and south in South America. Among other characters, the three share a particular arrangement of the arteries of the head. Virtually nothing is known of its biology.

Wikipedia contributors, Oecomys sydandersoni; see linked history · CC BY-SA 4.0 . Plain-text lead excerpt, at most 180 words; no infobox or later sections Retrieved 2026-10-05T13:46:40.939856+00:00. This reference remains separate from the taxonomic record.

Identity & source status

Scientific name
Oecomys sydandersoni Carleton, Emmons & Musser, 2009
Name authority
Carleton, Emmons & Musser, 2009
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.

  1. domainEukaryota (Chatton, 1925) Whittaker & Margulis, 1978
  2. kingdomAnimalia
  3. phylumChordata
  4. subphylumVertebrata
  5. infraphylumGnathostomata
  6. parvphylumOsteichthyes
  7. megaclassTetrapoda
  8. classMammalia Linnaeus, 1758
  9. subclassTheria Parker & Haswell, 1897
  10. infraclassEutheria Gill, 1872
  11. orderRodentia Bowdich, 1821
  12. suborderMyomorpha Brandt, 1855
  13. superfamilyMuroidea Illiger, 1811
  14. familyCricetidae Fischer, 1817
  15. subfamilySigmodontinae Wagner, 1843
  16. genusOecomys Thomas, 1906
  17. speciesOecomys sydandersoni Carleton, Emmons & Musser, 2009

Close classified relatives

These entries share the source’s genus, Oecomys. They are not necessarily the closest relatives established by molecular evidence.

SpeciesClassificationSource status
Bicolored Arboreal Rice RatOecomys bicolor (Tomes, 1860)CricetidaeChordataAccepted speciesRecorded extant
Cleber's Arboreal Rice RatOecomys cleberi Locks, 1981CricetidaeChordataAccepted speciesRecorded extant
Concolored Rice RatOecomys concolor (Wagner, 1845)CricetidaeChordataAccepted speciesRecorded extant
Mamore Arboreal Rice RatOecomys mamorae (Thomas, 1906)CricetidaeChordataAccepted speciesRecorded extant
King Arboreal Rice RatOecomys rex Thomas, 1910CricetidaeChordataAccepted speciesRecorded extant
Red Arboreal Rice RatOecomys rutilus Anthony, 1921CricetidaeChordataAccepted speciesRecorded extant
Foothill Arboreal Rice RatOecomys superans Thomas, 1911CricetidaeChordataAccepted speciesRecorded extant
Robert's Arboreal Rice RatOecomys roberti (Thomas, 1904)CricetidaeChordataAccepted speciesRecorded extant
Atlantic Forest OecomysOecomys catherinae Thomas, 1909CricetidaeChordataAccepted speciesRecorded extant
Tawny OecomysOecomys flavicans (Thomas, 1894)CricetidaeChordataAccepted speciesRecorded extant
Brazilian Arboreal Rice RatOecomys paricola (Thomas, 1904)CricetidaeChordataAccepted speciesRecorded extant
Dusky Arboreal Rice RatOecomys phaeotis (Thomas, 1901)CricetidaeChordataAccepted speciesRecorded extant

Browse 593 records assigned to Cricetidae.

Documented distribution

Source distribution statements, not a complete range map. A listed locality is not necessarily a place of origin.

South America

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.

  1. Carleton, Michael D., Louise H. Emmons, and Guy G. Musser. (2009). A new species of the rodent genus Oecomys (Cricetidae: Sigmodontinae: Oryzomini) from eastern Bolivia, with emended definitions of O. concolor (Wagner) and O. mamorae (Thomas). American Museum Novitates, No. 3661. 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:6SHTP. Classification follows source parent identifiers. English common names may vary by region.