Grooved Fingernailclam vs Witham Orb Mussel

Sphaerium simile compared with Sphaerium solidum

Key Differences

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

Taxonomic Classification

Rank	Grooved 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 simile	Sphaerium solidum

Evolutionary Relationship

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

Conservation Status

Grooved Fingernailclam

LC — Least Concern

Witham Orb Mussel

NT — Near Threatened

Physical Characteristics

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

Habitat & Geographic Range

Grooved 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