Black Gem vs Brook Floater

Microchrysa cyaneiventris compared with Alasmidonta varicosa

Key Differences

• Black Gem is Least Concern while Brook Floater is Vulnerable.

Taxonomic Classification

Rank	Black Gem	Brook Floater
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum	Arthropoda (Arthropods)	Mollusca (Mollusks)
Class	Insecta (Insects)	Bivalvia (Bivalvia)
Order	Diptera (Diptera)	Unionida (Unionida)
Family	Stratiomyidae	Unionidae
Genus	Microchrysa	Alasmidonta
Species	Microchrysa cyaneiventris	Alasmidonta varicosa

Evolutionary Relationship

Black Gem and Brook Floater share a common ancestor at the Kingdom level: Animalia. (Animals)

Conservation Status

Black Gem

LC — Least Concern

Brook Floater

VU — Vulnerable

Physical Characteristics

Attribute	Black Gem	Brook Floater
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Black Gem

Habitat

Typically found in virtually all terrestrial and freshwater habitats.

Range

Distributed across Belgium, Denmark, Norway, and Sweden.

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.

Black Gem

The Black Gem (Microchrysa cyaneiventris) is a species in the genus Microchrysa. It is currently classified as Least Concern on the IUCN Red List. Typically found in virtually all terrestrial and freshwater habitats.

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.