Merriam’s Pocket Mouse vs Pacific Spiny-rat

Perognathus merriami compared with Proechimys decumanus

Key Differences

• Merriam’s Pocket Mouse is Least Concern while Pacific Spiny-rat is Near Threatened.

Taxonomic Classification

Rank	Merriam’s Pocket Mouse	Pacific Spiny-rat
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class same	Mammalia (Mammals)	Mammalia (Mammals)
Order same	Rodentia (Rodents)	Rodentia (Rodents)
Family	Heteromyidae	Echimyidae
Genus	Perognathus	Proechimys
Species	Perognathus merriami	Proechimys decumanus

Evolutionary Relationship

Merriam’s Pocket Mouse and Pacific Spiny-rat share a common ancestor at the Order level: Rodentia. (Rodents)

Conservation Status

Merriam’s Pocket Mouse

LC — Least Concern

Pacific Spiny-rat

NT — Near Threatened

Physical Characteristics

Attribute	Merriam’s Pocket Mouse	Pacific Spiny-rat
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Merriam’s Pocket Mouse

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Pacific Spiny-rat

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Range

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