NATURAL HISTORY · CATALOGUE RECORD
Indefatigable Galapagos Mouse
Nesoryzomys indefessus (Thomas, 1899)
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 indefessus, also known as the Santa Cruz nesoryzomys or Indefatigable Galápagos mouse, is an extinct species of rodent from the genus Nesoryzomys of family Cricetidae from Galápagos Islands of Ecuador. It formerly lived on Santa Cruz Island, as well as Baltra Island, but is now extinct, probably due to the introduction of black rats. Another related rodent, N. narboroughi, is sometimes considered to be a subspecies of N. indefessus.
Wikipedia contributors, Nesoryzomys indefessus; see linked history · CC BY-SA 4.0 . Plain-text lead excerpt, at most 180 words; no infobox or later sections Retrieved 2026-10-05T12:05:41.731396+00:00. This reference remains separate from the taxonomic record.
Identity & source status
- Scientific name
- Nesoryzomys indefessus (Thomas, 1899)
- Name authority
- (Thomas, 1899)
- Common name
- Indefatigable 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 indefessus (Thomas, 1899)
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 |
| Santiago Galapagos MouseNesoryzomys swarthi Orr, 1938 | 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=633177 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:478DJ. Classification follows source parent identifiers. English common names may vary by region.