Brook Floater vs Willow Tarspot

Alasmidonta varicosa compared with Rhytisma salicinum

Key Differences

• Brook Floater is Vulnerable while Willow Tarspot is Least Concern.

Taxonomic Classification

Rank	Brook Floater	Willow Tarspot
Kingdom	Animalia (Animals)	Fungi (Fungi)
Phylum	Mollusca (Mollusks)	Ascomycota (Sac Fungi)
Class	Bivalvia (Bivalvia)	Leotiomycetes (Leotiomycetes)
Order	Unionida (Unionida)	Rhytismatales (Rhytismatales)
Family	Unionidae	Rhytismataceae
Genus	Alasmidonta	Rhytisma
Species	Alasmidonta varicosa	Rhytisma salicinum

Conservation Status

Brook Floater

VU — Vulnerable

Willow Tarspot

LC — Least Concern

Physical Characteristics

Attribute	Brook Floater	Willow Tarspot
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.

Willow Tarspot

Habitat

Native to Europe, inhabiting ecosystems characteristic of the region.

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.