Alder's necklace shell vs Brook Floater

Euspira nitida compared with Alasmidonta varicosa

Key Differences

• Alder's necklace shell is Least Concern while Brook Floater is Vulnerable.

Taxonomic Classification

Rank	Alder's necklace shell	Brook Floater
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Mollusca (Mollusks)	Mollusca (Mollusks)
Class	Gastropoda (Gastropoda)	Bivalvia (Bivalvia)
Order	Littorinimorpha (Littorinimorpha)	Unionida (Unionida)
Family	Naticidae	Unionidae
Genus	Euspira	Alasmidonta
Species	Euspira nitida	Alasmidonta varicosa

Evolutionary Relationship

Alder's necklace shell and Brook Floater share a common ancestor at the Phylum level: Mollusca. (Mollusks)

Conservation Status

Alder's necklace shell

LC — Least Concern

Brook Floater

VU — Vulnerable

Physical Characteristics

Attribute	Alder's necklace shell	Brook Floater
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Alder's necklace shell

Habitat

Typically found in terrestrial and aquatic habitats including forests and freshwater.

Range

Distributed across Belgium, Denmark, Norway, and Sweden.

Brook Floater

Habitat

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

Range

Found in United States. Currently classified as Vulnerable on the IUCN Red List, this species faces significant conservation challenges across its range.

Alder's necklace shell

The Alder's necklace shell (Euspira nitida) is a species in the genus Euspira. It is currently classified as Least Concern on the IUCN Red List. Typically found in terrestrial and aquatic habitats including forests and freshwater.

Brook Floater

The Brook Floater (Alasmidonta varicosa) is a species in the genus Alasmidonta. It is currently classified as Vulnerable on the IUCN Red List. Native to North America, inhabiting ecosystems characteristic of the region.