Blotched stingray vs Common Fat-tailed Mouse Opossum

Urotrygon chilensis compared with Thylamys pusillus

Key Differences

• Blotched stingray is Near Threatened while Common Fat-tailed Mouse Opossum is Least Concern.

Taxonomic Classification

Rank	Blotched stingray	Common Fat-tailed Mouse Opossum
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class	Elasmobranchii	Mammalia (Mammals)
Order	Myliobatiformes (Myliobatiformes)	Didelphimorphia (Didelphimorphia)
Family	Urotrygonidae	Didelphidae
Genus	Urotrygon	Thylamys
Species	Urotrygon chilensis	Thylamys pusillus

Evolutionary Relationship

Blotched stingray and Common Fat-tailed Mouse Opossum share a common ancestor at the Phylum level: Chordata. (Chordates)

Conservation Status

Blotched stingray

NT — Near Threatened

Common Fat-tailed Mouse Opossum

LC — Least Concern

Physical Characteristics

Attribute	Blotched stingray	Common Fat-tailed Mouse Opossum
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Blotched stingray

Habitat

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

Range

Found in Chile. Listed as Near Threatened, this species requires ongoing monitoring to prevent population decline.

Common Fat-tailed Mouse Opossum

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Blotched stingray

The Blotched stingray (Urotrygon chilensis) is a species in the genus Urotrygon. It is currently classified as Near Threatened on the IUCN Red List. Native to South America, inhabiting ecosystems characteristic of the region.

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.