Brook Alder vs Northern Dusky Slug

Alnus maritima compared with Arion fuscus

Key Differences

• Brook Alder is Endangered while Northern Dusky Slug is Data Deficient.

Taxonomic Classification

Rank	Brook Alder	Northern Dusky Slug
Kingdom	Plantae (Plants)	Animalia (Animals)
Phylum	Magnoliophyta (Flowering Plants)	Mollusca (Mollusks)
Class	Magnoliopsida (Dicots)	Gastropoda (Gastropoda)
Order	Fagales (Beeches & Oaks)	Stylommatophora (Stylommatophora)
Family	Betulaceae	Arionidae
Genus	Alnus	Arion
Species	Alnus maritima	Arion fuscus

Conservation Status

Brook Alder

EN — Endangered

Northern Dusky Slug

DD — Data Deficient

Physical Characteristics

Attribute	Brook Alder	Northern Dusky Slug
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Brook Alder

Habitat

Typically found in diverse terrestrial habitats from tropical forests to temperate regions.

Range

Distributed across Belgium, France, Netherlands, and United Kingdom. Currently classified as Endangered on the IUCN Red List, this species faces significant conservation challenges across its range.

Northern Dusky Slug

Habitat

Typically found in terrestrial and aquatic habitats including forests and freshwater.

Range

Found across Europe (7 countries).

Brook Alder

The Brook Alder (Alnus maritima) is a species in the genus Alnus. It is currently classified as Endangered on the IUCN Red List. Typically found in diverse terrestrial habitats from tropical forests to temperate regions.

Shared Countries

Both species can be found in 2 countries:

🇧🇪 Belgium 🇫🇷 France