Common Periwinkle vs Flat Periwinkle

Littorina littorea compared with Littorina obtusata

Taxonomic Classification

Rank	Common Periwinkle	Flat Periwinkle
Kingdom same	Animalia (动物界)	Animalia (动物界)
Phylum same	Mollusca (软体动物门)	Mollusca (软体动物门)
Class same	Gastropoda (腹足纲)	Gastropoda (腹足纲)
Order same	Littorinimorpha (滨螺形目)	Littorinimorpha (滨螺形目)
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

玉黍螺（Littorina littorea）在IUCN红色名录中被列为无危（LC）。在其分布范围内广泛分布，种群数量稳定，无直接保护威胁。

Shared Countries

Both species can be found in 4 countries:

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