Arctic barrel-bubble vs brittlestar

Retusa obtusa compared with Amphiura filiformis

Taxonomic Classification

Rank	Arctic barrel-bubble	brittlestar
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum	Mollusca (Mollusks)	Echinodermata (Echinoderms)
Class	Gastropoda (Gastropoda)	Ophiuroidea (Ophiuroidea)
Order	Cephalaspidea (Cephalaspidea)	Amphilepidida (Amphilepidida)
Family	Retusidae	Amphiuridae
Genus	Retusa	Amphiura
Species	Retusa obtusa	Amphiura filiformis

Evolutionary Relationship

Arctic barrel-bubble and brittlestar share a common ancestor at the Kingdom level: Animalia. (Animals)

Conservation Status

Arctic barrel-bubble

LC — Least Concern

brittlestar

LC — Least Concern

Physical Characteristics

Attribute	Arctic barrel-bubble	brittlestar
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Arctic barrel-bubble

Habitat

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

Range

Distributed across Belgium, Denmark, Norway, and Sweden.

brittlestar

Habitat

Native to Europe, inhabiting ecosystems characteristic of the region.

Range

Distributed across Denmark, Norway, and Sweden.

Arctic barrel-bubble

The Arctic barrel-bubble (Retusa obtusa) is a species in the genus Retusa. It is currently classified as Least Concern on the IUCN Red List. Typically found in terrestrial and aquatic habitats including forests and freshwater.

brittlestar

The Brittlestar (Amphiura filiformis) is a species in the genus Amphiura. It is currently classified as Least Concern on the IUCN Red List. Native to Europe, inhabiting ecosystems characteristic of the region.

Shared Countries

Both species can be found in 3 countries:

🇩🇰 Denmark 🇳🇴 Norway 🇸🇪 Sweden