NATURAL HISTORY · CATALOGUE RECORD
Santiago Galapagos Mouse
Nesoryzomys swarthi Orr, 1938
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
Nesoryzomys swarthi, also known as the Santiago nesoryzomys or Santiago Galápagos mouse, is a species of rodent in the genus Nesoryzomys of family Cricetidae. It is found only on Santiago in the Galápagos Islands. Its natural habitat is subtropical or tropical dry shrubland.
It was considered extinct since it was last recorded in 1906, but it was rediscovered in 1997. A smaller, related rice rat was also rediscovered—the Fernandina rice rat (N. fernandinae) on Fernandina.
Wikipedia contributors, Nesoryzomys swarthi; see linked history · CC BY-SA 4.0 . Plain-text lead excerpt, at most 180 words; no infobox or later sections Retrieved 2026-10-05T10:48:07.422228+00:00. This reference remains separate from the taxonomic record.
Identity & source status
- Scientific name
- Nesoryzomys swarthi Orr, 1938
- Name authority
- Orr, 1938
- Common name
- Santiago Galapagos Mouse
- Rank
- species
- Accepted status
- accepted
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Mammalia
- Order
- Rodentia
- Family
- Cricetidae
- Genus
- Nesoryzomys
- 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
- genusNesoryzomys Heller, 1904
- speciesNesoryzomys swarthi Orr, 1938
Close classified relatives
These entries share the source’s genus, Nesoryzomys. They are not necessarily the closest relatives established by molecular evidence.
| Species | Classification | Source status |
|---|---|---|
| Darwin's Galapagos MouseNesoryzomys darwini Osgood, 1929 | CricetidaeChordata | Accepted speciesRecorded extant |
| Fernandina Galapagos MouseNesoryzomys fernandinae Hutterer & Hirsch, 1979 | CricetidaeChordata | Accepted speciesRecorded extant |
| Indefatigable Galapagos MouseNesoryzomys indefessus (Thomas, 1899) | 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=633178 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:478DK. Classification follows source parent identifiers. English common names may vary by region.