Black Clock vs Brook Floater

Pterostichus madidus compared with Alasmidonta varicosa

Key Differences

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

Taxonomic Classification

Rank	Black Clock	Brook Floater
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum	Arthropoda (Arthropods)	Mollusca (Mollusks)
Class	Insecta (Insects)	Bivalvia (Bivalvia)
Order	Coleoptera (Beetles)	Unionida (Unionida)
Family	Carabidae	Unionidae
Genus	Pterostichus	Alasmidonta
Species	Pterostichus madidus	Alasmidonta varicosa

Evolutionary Relationship

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

Conservation Status

Black Clock

LC — Least Concern

Brook Floater

VU — Vulnerable

Physical Characteristics

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

Habitat & Geographic Range

Black Clock

Habitat

Typically found in virtually all terrestrial and freshwater habitats.

Range

Distributed across Belgium, Denmark, Norway, Sweden, and Switzerland.

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 Clock

The Black Clock (Pterostichus madidus) is a species in the genus Pterostichus. It is currently classified as Least Concern on the IUCN Red List. Typically found in virtually all terrestrial and freshwater habitats. Distributed across Belgium, Denmark, Norway, Sweden, and Switzerland.

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.