Brook Floater vs flat-backed millipede

Alasmidonta varicosa compared with Polydesmus complanatus

Key Differences

• Brook Floater is Vulnerable while flat-backed millipede is Least Concern.

Taxonomic Classification

Rank	Brook Floater	flat-backed millipede
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum	Mollusca (Mollusks)	Arthropoda (Arthropods)
Class	Bivalvia (Bivalvia)	Diplopoda (Diplopoda)
Order	Unionida (Unionida)	Polydesmida (Polydesmida)
Family	Unionidae	Polydesmidae
Genus	Alasmidonta	Polydesmus
Species	Alasmidonta varicosa	Polydesmus complanatus

Evolutionary Relationship

Brook Floater and flat-backed millipede share a common ancestor at the Kingdom level: Animalia. (Animals)

Conservation Status

Brook Floater

VU — Vulnerable

flat-backed millipede

LC — Least Concern

Physical Characteristics

Attribute	Brook Floater	flat-backed millipede
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.

flat-backed millipede

Habitat

Native to Europe, inhabiting ecosystems characteristic of the region.

Range

Distributed across 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.