Colombian Oldfield Mouse vs Common Larch

Thomasomys dispar compared with Larix decidua

Key Differences

• Colombian Oldfield Mouse is Data Deficient while Common Larch is Not Evaluated.

Taxonomic Classification

Rank	Colombian Oldfield Mouse	Common Larch
Kingdom	Animalia (Animals)	Plantae (Plants)
Phylum	Chordata (Chordates)	Coniferophyta (Conifers)
Class	Mammalia (Mammals)	Pinopsida (Conifers)
Order	Rodentia (Rodents)	Pinales (Pines & Allies)
Family	Cricetidae	Pinaceae (Pine Family)
Genus	Thomasomys	Larix
Species	Thomasomys dispar	Larix decidua

Conservation Status

Colombian Oldfield Mouse

DD — Data Deficient

Common Larch

NE — Not Evaluated

Physical Characteristics

Attribute	Colombian Oldfield Mouse	Common Larch
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.

Common Larch

Habitat

Typically found in temperate and boreal forests, often at higher elevations.

Range

Widely distributed across Asia (Armenia, Turkey), Europe (18 countries), North America (Canada, United States), and Oceania and the Pacific (New Zealand).

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.

Common Larch

Common Larch (<em>Larix decidua</em>) is a deciduous conifer in the family Pinaceae, distinguished among conifers by its seasonal needle drop. Its native range spans Asia (Armenia and Turkey), eighteen European countries, North America (Canada and the United States), and Oceania (New Zealand), encompassing a broad latitudinal range across temperate and boreal zones. The species typically inhabits temperate and boreal forests, often at higher elevations in montane and subalpine zones where it tolerates cold, short growing seasons and well-drained mineral soils. Common Larch is an important timber tree and is widely planted in forestry and as an ornamental species. Its golden autumn foliage is a distinctive feature of mountain landscapes in the Alps and Carpathians. The conservation status of this species has not been formally evaluated by the IUCN. It plays an ecological role in structuring montane forest communities and providing habitat for numerous associated species. Biological traits of this species remain poorly documented in the scientific literature.