Common Periwinkle vs Olive-gray Thomasomys

Littorina littorea compared with Thomasomys cinereus

Taxonomic Classification

Rank	Common Periwinkle	Olive-gray Thomasomys
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum	Mollusca (Mollusks)	Chordata (Chordates)
Class	Gastropoda (Gastropoda)	Mammalia (Mammals)
Order	Littorinimorpha (Littorinimorpha)	Rodentia (Rodents)
Family	Littorinidae	Cricetidae
Genus	Littorina	Thomasomys
Species	Littorina littorea	Thomasomys cinereus

Evolutionary Relationship

Common Periwinkle and Olive-gray Thomasomys share a common ancestor at the Kingdom level: Animalia. (Animals)

Conservation Status

Common Periwinkle

LC — Least Concern

Olive-gray Thomasomys

LC — Least Concern

Physical Characteristics

Attribute	Common Periwinkle	Olive-gray Thomasomys
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Common Periwinkle

Habitat

Typically found in terrestrial and aquatic habitats including forests and freshwater.

Range

Found across Europe (4 countries) and North America (Canada, United States).

Olive-gray Thomasomys

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Range

Found in Ecuador.

Common Periwinkle

Common Periwinkle (Littorina littorea) is classified as Least Concern (LC) on the IUCN Red List. Widespread and abundant across its range, with stable populations and no immediate conservation concerns.