Brook Floater vs flat periwinkle

Alasmidonta varicosa compared with Littorina fabalis

Key Differences

• Brook Floater is Vulnerable while flat periwinkle is Least Concern.

Taxonomic Classification

Rank	Brook Floater	flat periwinkle
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Mollusca (Mollusks)	Mollusca (Mollusks)
Class	Bivalvia (Bivalvia)	Gastropoda (Gastropoda)
Order	Unionida (Unionida)	Littorinimorpha (Littorinimorpha)
Family	Unionidae	Littorinidae
Genus	Alasmidonta	Littorina
Species	Alasmidonta varicosa	Littorina fabalis

Evolutionary Relationship

Brook Floater and flat periwinkle share a common ancestor at the Phylum level: Mollusca. (Mollusks)

Conservation Status

Brook Floater

VU — Vulnerable

flat periwinkle

LC — Least Concern

Physical Characteristics

Attribute	Brook Floater	flat periwinkle
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

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.

flat periwinkle

Habitat

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

Range

Distributed across Belgium, Denmark, Norway, and Sweden.

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.