Columbia River Signal Crayfish vs Sooty Crayfish

Pacifastacus leniusculus compared with Pacifastacus nigrescens

Key Differences

• Columbia River Signal Crayfish is Not Evaluated while Sooty Crayfish is Extinct.

Taxonomic Classification

Rank	Columbia River Signal Crayfish	Sooty Crayfish
Kingdom same	Animalia (สัตว์)	Animalia (สัตว์)
Phylum same	Arthropoda (สัตว์ขาปล้อง)	Arthropoda (สัตว์ขาปล้อง)
Class same	Malacostraca (Crustaceans)	Malacostraca (Crustaceans)
Order same	Decapoda (Decapoda)	Decapoda (Decapoda)
Family same	Astacidae	Astacidae
Genus same	Pacifastacus	Pacifastacus
Species	Pacifastacus leniusculus	Pacifastacus nigrescens

Evolutionary Relationship

Columbia River Signal Crayfish and Sooty Crayfish share a common ancestor at the Genus level: Pacifastacus.

Conservation Status

Columbia River Signal Crayfish

NE — Not Evaluated

Sooty Crayfish

EX — Extinct

Physical Characteristics

Attribute	Columbia River Signal Crayfish	Sooty Crayfish
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Columbia River Signal Crayfish

Habitat

Typically found in marine, freshwater, and terrestrial environments.

Range

Widely distributed across Asia (Japan), Europe (26 countries), and North America (United States).

Sooty Crayfish

Habitat

Typically found in marine, freshwater, and terrestrial environments.

Range

Found in Norway.

Columbia River Signal Crayfish

<em>Pacifastacus leniusculus</em>, the Columbia River signal crayfish, is a freshwater crustacean in the family Astacidae native to the Pacific Northwest of North America and widely introduced across Europe, Japan, and other regions. This species has not been evaluated by the IUCN but is recognised as one of the most ecologically damaging invasive freshwater species in Europe, present in 26 European countries, Japan, and its native range in the United States. Signal crayfish are large, aggressive, and highly fecund, capable of displacing native crayfish species through competition and through transmission of crayfish plague, a disease caused by the oomycete <em>Aphanomyces astaci</em>, to which North American crayfish have evolved resistance but European species have not. This species inhabits a wide range of freshwater environments including rivers, streams, lakes, and estuaries, as well as adjacent terrestrial habitats. Signal crayfish are omnivores, consuming aquatic plants, invertebrates, fish eggs, and organic detritus, and their burrowing activity can destabilise stream banks and increase turbidity. Management of invasive populations is a major focus of freshwater conservation in Europe. Biological traits of this species remain poorly documented in the scientific literature.

Shared Countries

Both species can be found in 1 countries:

🇳🇴 Norway