Atlantic Ancula vs Flat Periwinkle

Ancula gibbosa compared with Littorina obtusata

Taxonomic Classification

Rank	Atlantic Ancula	Flat Periwinkle
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Mollusca (Mollusks)	Mollusca (Mollusks)
Class same	Gastropoda (Gastropoda)	Gastropoda (Gastropoda)
Order	Nudibranchia (Nudibranchia)	Littorinimorpha (Littorinimorpha)
Family	Goniodorididae	Littorinidae
Genus	Ancula	Littorina
Species	Ancula gibbosa	Littorina obtusata

Evolutionary Relationship

Atlantic Ancula and Flat Periwinkle share a common ancestor at the Class level: Gastropoda. (Gastropoda)

Conservation Status

Atlantic Ancula

LC — Least Concern

Flat Periwinkle

LC — Least Concern

Physical Characteristics

Attribute	Atlantic Ancula	Flat Periwinkle
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Atlantic Ancula

Habitat

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

Range

Distributed across Denmark, Norway, and Sweden.

Flat Periwinkle

Habitat

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

Range

Distributed across Belgium, Denmark, Norway, and Sweden.

Atlantic Ancula

The Atlantic Ancula (Ancula gibbosa) is a species in the genus Ancula. It is currently classified as Least Concern on the IUCN Red List. Typically found in terrestrial and aquatic habitats including forests and freshwater.

Shared Countries

Both species can be found in 3 countries:

🇩🇰 Denmark 🇳🇴 Norway 🇸🇪 Sweden