Common Periwinkle vs Flat Periwinkle

Littorina littorea compared with Littorina obtusata

Taxonomic Classification

Rank	Common Periwinkle	Flat Periwinkle
Kingdom same	Animalia (動物)	Animalia (動物)
Phylum same	Mollusca (軟体動物)	Mollusca (軟体動物)
Class same	Gastropoda (腹足綱)	Gastropoda (腹足綱)
Order same	Littorinimorpha (タマキビガイ下目)	Littorinimorpha (タマキビガイ下目)
Family same	Littorinidae	Littorinidae
Genus same	Littorina	Littorina
Species	Littorina littorea	Littorina obtusata

Evolutionary Relationship

Common Periwinkle and Flat Periwinkle share a common ancestor at the Genus level: Littorina.

Conservation Status

Common Periwinkle

LC — Least Concern

Flat Periwinkle

LC — Least Concern

Physical Characteristics

Attribute	Common Periwinkle	Flat Periwinkle
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).

Flat Periwinkle

Habitat

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

Range

Distributed across Belgium, Denmark, Norway, and Sweden.

Common Periwinkle

タマキビ（Littorina littorea）はIUCNレッドリストで軽度懸念（LC）に分類されている。分布域全体で広く生息し個体数は安定しており、早急な保全上の懸念はない。

Shared Countries

Both species can be found in 4 countries:

🇧🇪 Belgium 🇩🇰 Denmark 🇳🇴 Norway 🇸🇪 Sweden