Bartail spurdog vs Blue Dog

Squalus notocaudatus compared with Squalus acanthias

Key Differences

• Bartail spurdog is Least Concern while Blue Dog is Endangered.

Taxonomic Classification

Rank	Bartail spurdog	Blue Dog
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class same	Elasmobranchii	Elasmobranchii
Order same	Squaliformes (Squaliformes)	Squaliformes (Squaliformes)
Family same	Squalidae	Squalidae
Genus same	Squalus	Squalus
Species	Squalus notocaudatus	Squalus acanthias

Evolutionary Relationship

Bartail spurdog and Blue Dog share a common ancestor at the Genus level: Squalus.

Conservation Status

Bartail spurdog

LC — Least Concern

Blue Dog

EN — Endangered

Physical Characteristics

Attribute	Bartail spurdog	Blue Dog
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Bartail spurdog

Blue Dog

Habitat

Found across multiple habitat types including temperate broadleaf and mixed forests, temperate grasslands and steppes, and montane grasslands and shrublands, among 5 distinct biome types within the Neotropic biogeographic realm.

Range

Distributed across Chile, Denmark, Norway, and Sweden. Currently classified as Endangered on the IUCN Red List, this species faces significant conservation challenges across its range.

Bartail spurdog

The Bartail spurdog (Squalus notocaudatus) is a species in the genus Squalus. It is currently classified as Least Concern on the IUCN Red List.

Blue Dog

The Blue Dog (Squalus acanthias) is a species in the genus Squalus. It is currently classified as Endangered on the IUCN Red List. Found across multiple habitat types including temperate broadleaf and mixed forests, temperate grasslands and steppes, and montane grasslands and shrublands, among 5 distinct biome types within the Neotropic biogeographic realm.