Brook Floater vs Northern Dusky Slug

Alasmidonta varicosa compared with Arion fuscus

Key Differences

• Brook Floater is Vulnerable while Northern Dusky Slug is Data Deficient.

Taxonomic Classification

Rank	Brook Floater	Northern Dusky Slug
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Mollusca (Mollusks)	Mollusca (Mollusks)
Class	Bivalvia (Bivalvia)	Gastropoda (Gastropoda)
Order	Unionida (Unionida)	Stylommatophora (Stylommatophora)
Family	Unionidae	Arionidae
Genus	Alasmidonta	Arion
Species	Alasmidonta varicosa	Arion fuscus

Evolutionary Relationship

Brook Floater and Northern Dusky Slug share a common ancestor at the Phylum level: Mollusca. (Mollusks)

Conservation Status

Brook Floater

VU — Vulnerable

Northern Dusky Slug

DD — Data Deficient

Physical Characteristics

Attribute	Brook Floater	Northern Dusky Slug
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.

Northern Dusky Slug

Habitat

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

Range

Found across Europe (7 countries).

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.