Colombian Oldfield Mouse vs Western Dwarf

Thomasomys dispar compared with Elachista triseriatella

Key Differences

• Colombian Oldfield Mouse is Data Deficient while Western Dwarf is Not Evaluated.

Taxonomic Classification

Rank	Colombian Oldfield Mouse	Western Dwarf
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum	Chordata (Chordates)	Arthropoda (Arthropods)
Class	Mammalia (Mammals)	Insecta (Insects)
Order	Rodentia (Rodents)	Lepidoptera (Butterflies & Moths)
Family	Cricetidae	Elachistidae
Genus	Thomasomys	Elachista
Species	Thomasomys dispar	Elachista triseriatella

Evolutionary Relationship

Colombian Oldfield Mouse and Western Dwarf share a common ancestor at the Kingdom level: Animalia. (Animals)

Conservation Status

Colombian Oldfield Mouse

DD — Data Deficient

Western Dwarf

NE — Not Evaluated

Physical Characteristics

Attribute	Colombian Oldfield Mouse	Western Dwarf
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Colombian Oldfield Mouse

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Range

Found in Colombia.

Western Dwarf

Habitat

Typically found in virtually all terrestrial and freshwater habitats.

Range

Distributed across Belgium and Denmark.

Colombian Oldfield Mouse

<em>Thomasomys dispar</em>, commonly known as the Colombian Oldfield Mouse, is a small rodent species belonging to the genus <em>Thomasomys</em> within the family Cricetidae. This species is classified as Data Deficient, indicating that insufficient information is currently available to evaluate its conservation status with confidence. It has been documented in Colombia, where it inhabits diverse terrestrial and aquatic-adjacent environments. Members of the genus <em>Thomasomys</em> are typically associated with high-altitude Andean habitats, including páramo grasslands, shrublands, and montane forest edges, where they occupy ground-level microhabitats and burrow in soft soils. These mice are generally omnivorous, consuming seeds, plant material, and invertebrates, though specific dietary data for <em>Thomasomys dispar</em> have not been recorded. Biological traits of this species remain poorly documented in the scientific literature. The Data Deficient classification highlights the need for targeted surveys in Colombian Andean regions to determine population size, distribution, and the ecological requirements of this poorly known rodent.