Rhomboid Fingernailclam vs Witham Orb Mussel

Sphaerium rhomboideum compared with Sphaerium solidum

Key Differences

• Rhomboid Fingernailclam is Least Concern while Witham Orb Mussel is Near Threatened.

Taxonomic Classification

Rank	Rhomboid Fingernailclam	Witham Orb Mussel
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Mollusca (Mollusks)	Mollusca (Mollusks)
Class same	Bivalvia (Bivalvia)	Bivalvia (Bivalvia)
Order same	Sphaeriida (Sphaeriida)	Sphaeriida (Sphaeriida)
Family same	Sphaeriidae	Sphaeriidae
Genus same	Sphaerium	Sphaerium
Species	Sphaerium rhomboideum	Sphaerium solidum

Evolutionary Relationship

Rhomboid Fingernailclam and Witham Orb Mussel share a common ancestor at the Genus level: Sphaerium.

Conservation Status

Rhomboid Fingernailclam

LC — Least Concern

Witham Orb Mussel

NT — Near Threatened

Physical Characteristics

Attribute	Rhomboid Fingernailclam	Witham Orb Mussel
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Rhomboid Fingernailclam

Habitat

Native to Europe and North America, inhabiting ecosystems characteristic of the region.

Range

Distributed across Norway and United States.

Witham Orb Mussel

Habitat

Native to Europe, inhabiting ecosystems characteristic of the region.

Range

Found in Norway. Listed as Near Threatened, this species requires ongoing monitoring to prevent population decline.

Shared Countries

Both species can be found in 1 countries:

🇳🇴 Norway