Common Fat-tailed Mouse Opossum vs Common Ground-Pine

Thylamys pusillus compared with Dendrolycopodium obscurum

Key Differences

• Common Fat-tailed Mouse Opossum is Least Concern while Common Ground-Pine is Not Evaluated.

Taxonomic Classification

Rank	Common Fat-tailed Mouse Opossum	Common Ground-Pine
Kingdom	Animalia (Animals)	Plantae (Plants)
Phylum	Chordata (Chordates)	Tracheophyta
Class	Mammalia (Mammals)	Lycopodiopsida (Lycopodiopsida)
Order	Didelphimorphia (Didelphimorphia)	Lycopodiales (Lycopodiales)
Family	Didelphidae	Lycopodiaceae
Genus	Thylamys	Dendrolycopodium
Species	Thylamys pusillus	Dendrolycopodium obscurum

Conservation Status

Common Fat-tailed Mouse Opossum

LC — Least Concern

Common Ground-Pine

NE — Not Evaluated

Physical Characteristics

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

Habitat & Geographic Range

Common Fat-tailed Mouse Opossum

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Common Ground-Pine

Habitat

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

Range

Distributed across Canada and United States.

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.

Common Ground-Pine

The common ground pine, <em>Dendrolycopodium obscurum</em>, is a vascular plant belonging to the family Lycopodiaceae, a lineage of ancient clubmosses. This species is typically found across North America, with its known range encompassing Canada and the United States. As a lycophyte, <em>Dendrolycopodium obscurum</em> represents a deeply divergent lineage among land plants, distinct from mosses and ferns. The species typically grows in moist forested habitats, particularly in coniferous and mixed woodlands where humidity and leaf litter provide suitable conditions for its growth. Its upright, tree-like sporophylls give it the common name ground pine. No dietary information has been provided for this species. Biological traits of this species remain poorly documented in the scientific literature.