swollen river mussel vs mulette épaisse

Unio tumidus compared with Unio crassus

Key Differences

• swollen river mussel is Least Concern while mulette épaisse is Endangered.

Taxonomic Classification

Rank	swollen river mussel	mulette épaisse
Kingdom same	Animalia (animal)	Animalia (animal)
Phylum same	Mollusca (mollusques)	Mollusca (mollusques)
Class same	Bivalvia (Bivalvia)	Bivalvia (Bivalvia)
Order same	Unionida (Unionoida)	Unionida (Unionoida)
Family same	Unionidae	Unionidae
Genus same	Unio	Unio
Species	Unio tumidus	Unio crassus

Evolutionary Relationship

swollen river mussel and mulette épaisse share a common ancestor at the Genus level: Unio.

Conservation Status

swollen river mussel

LC — Least Concern

mulette épaisse

EN — Endangered

Physical Characteristics

Attribute	swollen river mussel	mulette épaisse
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

swollen river mussel

Habitat

Native to Europe, inhabiting ecosystems characteristic of the region.

Range

Distributed across Denmark, Norway, and Sweden.

mulette épaisse

Habitat

Native to Europe, inhabiting ecosystems characteristic of the region.

Range

Distributed across Belgium, Denmark, Norway, Sweden, and Ukraine. Currently classified as Endangered on the IUCN Red List, this species faces significant conservation challenges across its range.

Shared Countries

Both species can be found in 3 countries:

🇩🇰 Denmark 🇳🇴 Norway 🇸🇪 Sweden