Brook Floater vs Chalky Macoma

Alasmidonta varicosa compared with Macoma calcarea

Key Differences

• Brook Floater is Vulnerable while Chalky Macoma is Least Concern.

Taxonomic Classification

Rank	Brook Floater	Chalky Macoma
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Mollusca (Mollusks)	Mollusca (Mollusks)
Class same	Bivalvia (Bivalvia)	Bivalvia (Bivalvia)
Order	Unionida (Unionida)	Cardiida (Cardiida)
Family	Unionidae	Tellinidae
Genus	Alasmidonta	Macoma
Species	Alasmidonta varicosa	Macoma calcarea

Evolutionary Relationship

Brook Floater and Chalky Macoma share a common ancestor at the Class level: Bivalvia. (Bivalvia)

Conservation Status

Brook Floater

VU — Vulnerable

Chalky Macoma

LC — Least Concern

Physical Characteristics

Attribute	Brook Floater	Chalky Macoma
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.

Chalky Macoma

Habitat

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

Range

Distributed across Belgium, Denmark, Norway, Sweden, and United States.

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.

Chalky Macoma

The Chalky Macoma (Macoma calcarea) is a species in the genus Macoma. It is currently classified as Least Concern on the IUCN Red List. Native to Europe and North America, inhabiting ecosystems characteristic of the region.

Shared Countries

Both species can be found in 1 countries:

🇺🇸 United States