Brook Floater vs Brown Cup

Alasmidonta varicosa compared with Rutstroemia firma

Key Differences

• Brook Floater is Vulnerable while Brown Cup is Least Concern.

Taxonomic Classification

Rank	Brook Floater	Brown Cup
Kingdom	Animalia (สัตว์)	Fungi (เห็ดรา)
Phylum	Mollusca (มอลลัสกา)	Ascomycota (Sac Fungi)
Class	Bivalvia (ชั้นไบวาลเวีย)	Leotiomycetes (Leotiomycetes)
Order	Unionida (Unionida)	Helotiales (Helotiales)
Family	Unionidae	Rutstroemiaceae
Genus	Alasmidonta	Rutstroemia
Species	Alasmidonta varicosa	Rutstroemia firma

Conservation Status

Brook Floater

VU — Vulnerable

Brown Cup

LC — Least Concern

Physical Characteristics

Attribute	Brook Floater	Brown Cup
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 Cup

Habitat

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

Range

Distributed across Belgium, Brazil, 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.

Brown Cup

The Brown Cup (Rutstroemia firma) is a species in the genus Rutstroemia. It is currently classified as Least Concern on the IUCN Red List. Native to Europe and South America, inhabiting ecosystems characteristic of the region.