Common Fat-tailed Mouse Opossum vs Itomaki-ei

Thylamys pusillus compared with Mobula japanica

Key Differences

• Common Fat-tailed Mouse Opossum is Least Concern while Itomaki-ei is Not Evaluated.

Taxonomic Classification

Rank	Common Fat-tailed Mouse Opossum	Itomaki-ei
Kingdom same	Animalia (動物)	Animalia (動物)
Phylum same	Chordata (脊索動物)	Chordata (脊索動物)
Class	Mammalia (哺乳類)	Elasmobranchii
Order	Didelphimorphia (Didelphimorphia)	Myliobatiformes (トビエイ目)
Family	Didelphidae	Myliobatidae
Genus	Thylamys	Mobula
Species	Thylamys pusillus	Mobula japanica

Evolutionary Relationship

Common Fat-tailed Mouse Opossum and Itomaki-ei share a common ancestor at the Phylum level: Chordata. (脊索動物)

Conservation Status

Common Fat-tailed Mouse Opossum

LC — Least Concern

Itomaki-ei

NE — Not Evaluated

Physical Characteristics

Attribute	Common Fat-tailed Mouse Opossum	Itomaki-ei
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Common Fat-tailed Mouse Opossum

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Itomaki-ei

Habitat

Native to Asia and South America, inhabiting ecosystems characteristic of the region.

Range

Distributed across Chile and Taiwan.

Common Fat-tailed Mouse Opossum

The Common Fat-tailed Mouse Opossum (<em>Thylamys pusillus</em>) is a small marsupial belonging to the genus Thylamys within the family Didelphidae. Like other members of its genus, this species typically stores fat in its tail, which becomes swollen during periods of food abundance and is metabolised during leaner times, a physiological adaptation that provides energy reserves. <em>Thylamys pusillus</em> is generally found in diverse terrestrial and aquatic ecosystems, often in dry woodlands, scrublands, and grassland habitats of South America. The species is assessed as Least Concern on the IUCN Red List, indicating it is not currently considered at risk of extinction. Detailed geographic range data are not available in the current record, but members of this genus are typically distributed across parts of Argentina, Bolivia, Paraguay, and Uruguay. Biological traits including average lifespan, body dimensions, and specific dietary composition remain poorly documented in the scientific literature, though Thylamys species are generally considered omnivorous, often consuming insects, small vertebrates, and plant material.