Common Fat-tailed Mouse Opossum vs

Thylamys pusillus compared with Echinoderma calcicola

Key Differences

• Common Fat-tailed Mouse Opossum is Least Concern while is Endangered.

Taxonomic Classification

Rank	Common Fat-tailed Mouse Opossum
Kingdom	Animalia (Animals)	Fungi (Fungi)
Phylum	Chordata (Chordates)	Basidiomycota (Club Fungi)
Class	Mammalia (Mammals)	Agaricomycetes (Mushrooms)
Order	Didelphimorphia (Didelphimorphia)	Agaricales (Gilled Mushrooms)
Family	Didelphidae	Agaricaceae (Agarics)
Genus	Thylamys	Echinoderma
Species	Thylamys pusillus	Echinoderma calcicola

Conservation Status

Common Fat-tailed Mouse Opossum

LC — Least Concern

EN — Endangered

Physical Characteristics

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

Habitat & Geographic Range

Common Fat-tailed Mouse Opossum

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Habitat

Found across multiple habitat types including tropical and subtropical moist broadleaf forests, tropical and subtropical dry broadleaf forests, and tropical and subtropical grasslands and savannas, among 5 distinct biome types within the Neotropic biogeographic realm. Populations are also found in montane and highland environments at higher elevations.

Range

Distributed across Brazil, Denmark, Norway, and Sweden. Currently classified as Endangered on the IUCN Red List, this species faces significant conservation challenges across its range.

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.

Echinoderma calcicola is a medium-sized mushroom with a pale cap covered in dark, pointed scales and a similarly decorated stem, growing in calcareous grasslands and woodland edges in Europe. It is considered an indicator of ancient, species-rich calcareous habitats. Classified as Endangered, this species is severely threatened by agricultural intensification and loss of limestone grassland habitats.