NATURAL HISTORY · CATALOGUE RECORD
Underwood's Ichthyomyine
Rheomys underwoodi Thomas, 1906
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
Underwood's water mouse (Rheomys underwoodi) is a species of rodent in the family Cricetidae. It is found in Costa Rican and western Panamanian cloud forest at altitudes from 1500 to 2000 m. This mouse lives near streams in highland forests and is semiaquatic; its carnivorous diet includes invertebrates. Although its range is small, it includes a number of protected areas, and the population appears to be sizable; the IUCN therefore rates the conservation status of the species as "least concern".
Wikipedia contributors, Underwood's water mouse; see linked history · CC BY-SA 4.0 . Plain-text lead excerpt, at most 180 words; no infobox or later sections Retrieved 2026-10-05T07:59:51.952501+00:00. This reference remains separate from the taxonomic record.
Identity & source status
- Scientific name
- Rheomys underwoodi Thomas, 1906
- Name authority
- Thomas, 1906
- Common name
- Underwood's Ichthyomyine
- Rank
- species
- Accepted status
- accepted
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Mammalia
- Order
- Rodentia
- Family
- Cricetidae
- Genus
- Rheomys
- 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
- genusRheomys Thomas, 1906
- speciesRheomys underwoodi Thomas, 1906
Close classified relatives
These entries share the source’s genus, Rheomys. They are not necessarily the closest relatives established by molecular evidence.
| Species | Classification | Source status |
|---|---|---|
| Thomas' IchthyomyineRheomys thomasi Dickey, 1928 | CricetidaeChordata | Accepted speciesRecorded extant |
| Goodwin's Water MouseRheomys mexicanus Goodwin, 1959 | CricetidaeChordata | Accepted speciesRecorded extant |
| Goldman's IchthyomyineRheomys raptor Goldman, 1912 | 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=633336 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:4S632. Classification follows source parent identifiers. English common names may vary by region.