Brook Floater vs Red-headed Pigmy

Alasmidonta varicosa compared with Stigmella ruficapitella

Key Differences

• Brook Floater is Vulnerable while Red-headed Pigmy is Least Concern.

Taxonomic Classification

Rank	Brook Floater	Red-headed Pigmy
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum	Mollusca (Mollusks)	Arthropoda (Arthropods)
Class	Bivalvia (Bivalvia)	Insecta (Insects)
Order	Unionida (Unionida)	Lepidoptera (Butterflies & Moths)
Family	Unionidae	Nepticulidae
Genus	Alasmidonta	Stigmella
Species	Alasmidonta varicosa	Stigmella ruficapitella

Evolutionary Relationship

Brook Floater and Red-headed Pigmy share a common ancestor at the Kingdom level: Animalia. (Animals)

Conservation Status

Brook Floater

VU — Vulnerable

Red-headed Pigmy

LC — Least Concern

Physical Characteristics

Attribute	Brook Floater	Red-headed Pigmy
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.

Red-headed Pigmy

Habitat

Typically found in virtually all terrestrial and freshwater habitats.

Range

Distributed across Belgium, 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.