Brook Floater vs Brown Roll Rim

Alasmidonta varicosa compared with Paxillus involutus

Key Differences

Brook Floater is Vulnerable while Brown Roll Rim is Least Concern.

Taxonomic Classification

Rank	Brook Floater	Brown Roll Rim
Kingdom	Animalia (Animals)	Fungi (Fungi)
Phylum	Mollusca (Mollusks)	Basidiomycota (Club Fungi)
Class	Bivalvia (Bivalvia)	Agaricomycetes (Mushrooms)
Order	Unionida (Unionida)	Boletales (Boletales)
Family	Unionidae	Paxillaceae
Genus	Alasmidonta	Paxillus
Species	Alasmidonta varicosa	Paxillus involutus

Conservation Status

Brook Floater

VU — Vulnerable

Brown Roll Rim

LC — Least Concern

Physical Characteristics

Attribute	Brook Floater	Brown Roll Rim
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.

Brown Roll Rim

Habitat

Typically found in forest floors, decomposing wood, and soil ecosystems.

Range

Widely distributed across Europe (4 countries), North America (United States), and South America (Brazil, Chile).

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.

Brown Roll Rim

The Brown Roll Rim (Paxillus involutus) is a species in the genus Paxillus. It is currently classified as Least Concern on the IUCN Red List. Typically found in forest floors, decomposing wood, and soil ecosystems.