Brook Floater vs Brown Screw-moss

Alasmidonta varicosa compared with Syntrichia princeps

Key Differences

• Brook Floater is Vulnerable while Brown Screw-moss is Near Threatened.

Taxonomic Classification

Rank	Brook Floater	Brown Screw-moss
Kingdom	Animalia (Animals)	Plantae (Plants)
Phylum	Mollusca (Mollusks)	Bryophyta
Class	Bivalvia (Bivalvia)	Bryopsida (Bryopsida)
Order	Unionida (Unionida)	Pottiales (Pottiales)
Family	Unionidae	Pottiaceae
Genus	Alasmidonta	Syntrichia
Species	Alasmidonta varicosa	Syntrichia princeps

Conservation Status

Brook Floater

VU — Vulnerable

Brown Screw-moss

NT — Near Threatened

Physical Characteristics

Attribute	Brook Floater	Brown Screw-moss
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 Screw-moss

Habitat

Native to Europe, inhabiting ecosystems characteristic of the region.

Range

Distributed across Norway, Portugal, and Sweden. Listed as Near Threatened, this species requires ongoing monitoring to prevent population decline.

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 Screw-moss

The Brown Screw-moss (Syntrichia princeps) is a species in the genus Syntrichia. It is currently classified as Near Threatened on the IUCN Red List. Native to Europe, inhabiting ecosystems characteristic of the region.