Brook Floater vs Spiral Tarcrust

Alasmidonta varicosa compared with Eutypa spinosa

Key Differences

Brook Floater is Vulnerable while Spiral Tarcrust is Least Concern.

Taxonomic Classification

Rank	Brook Floater	Spiral Tarcrust
Kingdom	Animalia (Animals)	Fungi (Fungi)
Phylum	Mollusca (Mollusks)	Ascomycota (Sac Fungi)
Class	Bivalvia (Bivalvia)	Sordariomycetes (Sordariomycetes)
Order	Unionida (Unionida)	Xylariales (Xylariales)
Family	Unionidae	Diatrypaceae
Genus	Alasmidonta	Eutypa
Species	Alasmidonta varicosa	Eutypa spinosa

Conservation Status

Brook Floater

VU — Vulnerable

Spiral Tarcrust

LC — Least Concern

Physical Characteristics

Attribute	Brook Floater	Spiral Tarcrust
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.

Spiral Tarcrust

Habitat

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

Range

Distributed across Belgium, Denmark, Norway, Sweden, and United States.

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.