swollen river mussel vs Thick Shelled River Mussel

Unio tumidus compared with Unio crassus

Key Differences

• swollen river mussel is Least Concern while Thick Shelled River Mussel is Endangered.

Taxonomic Classification

Rank	swollen river mussel	Thick Shelled River Mussel
Kingdom same	Animalia (hayvan)	Animalia (hayvan)
Phylum same	Mollusca (Yumuşakçalar)	Mollusca (Yumuşakçalar)
Class same	Bivalvia (Midyeler)	Bivalvia (Midyeler)
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 Thick Shelled River Mussel share a common ancestor at the Genus level: Unio.

Conservation Status

swollen river mussel

LC — Least Concern

Thick Shelled River Mussel

EN — Endangered

Physical Characteristics

Attribute	swollen river mussel	Thick Shelled River Mussel
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.

Thick Shelled River Mussel

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