Colombian Oldfield Mouse vs Eastern Pygmy Marmoset

Thomasomys dispar compared with Cebuella niveiventris

Key Differences

• Colombian Oldfield Mouse is Data Deficient while Eastern Pygmy Marmoset is Vulnerable.

Taxonomic Classification

Rank	Colombian Oldfield Mouse	Eastern Pygmy Marmoset
Kingdom same	Animalia (животные)	Animalia (животные)
Phylum same	Chordata (хордовые)	Chordata (хордовые)
Class same	Mammalia (млекопитающие)	Mammalia (млекопитающие)
Order	Rodentia (грызуны)	Primates (приматы)
Family	Cricetidae	Callitrichidae
Genus	Thomasomys	Cebuella
Species	Thomasomys dispar	Cebuella niveiventris

Evolutionary Relationship

Colombian Oldfield Mouse and Eastern Pygmy Marmoset share a common ancestor at the Class level: Mammalia. (млекопитающие)

Conservation Status

Colombian Oldfield Mouse

DD — Data Deficient

Eastern Pygmy Marmoset

VU — Vulnerable

Physical Characteristics

Attribute	Colombian Oldfield Mouse	Eastern Pygmy Marmoset
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.

Eastern Pygmy Marmoset

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Range

Found in Ecuador. Currently classified as Vulnerable on the IUCN Red List, this species faces significant conservation challenges across its range.

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.