nut fingernailclam vs small tortoiseshell

Sphaerium rivicola compared with Aglais urticae

Key Differences

• nut fingernailclam is Not Evaluated while small tortoiseshell is Near Threatened.

Taxonomic Classification

Rank	nut fingernailclam	small tortoiseshell
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum	Mollusca (Mollusks)	Arthropoda (Arthropods)
Class	Bivalvia (Bivalvia)	Insecta (Insects)
Order	Sphaeriida (Sphaeriida)	Lepidoptera (Butterflies & Moths)
Family	Sphaeriidae	Nymphalidae (Brush-footed Butterflies)
Genus	Sphaerium	Aglais
Species	Sphaerium rivicola	Aglais urticae

Evolutionary Relationship

nut fingernailclam and small tortoiseshell share a common ancestor at the Kingdom level: Animalia. (Animals)

Conservation Status

nut fingernailclam

NE — Not Evaluated

small tortoiseshell

NT — Near Threatened

Physical Characteristics

Attribute	nut fingernailclam	small tortoiseshell
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

nut fingernailclam

Habitat

Native to Europe, inhabiting ecosystems characteristic of the region.

Range

Distributed across Belgium, Denmark, Norway, and Ukraine.

small tortoiseshell

Habitat

Typically found in virtually all terrestrial and freshwater habitats.

Range

Found across Europe (41 countries). Listed as Near Threatened, this species requires ongoing monitoring to prevent population decline.

small tortoiseshell

small tortoiseshell (Aglais urticae) is classified as Near Threatened (NT) on the IUCN Red List. Close to qualifying as threatened, with populations that may become vulnerable without conservation action.

Shared Countries

Both species can be found in 4 countries:

🇧🇪 Belgium 🇩🇰 Denmark 🇳🇴 Norway 🇺🇦 Ukraine