Bigeye thresher vs Sparsetooth dogfish

Alopias pelagicus compared with Scymnodalatias oligodon

Key Differences

• Bigeye thresher is Endangered while Sparsetooth dogfish is Least Concern.

Taxonomic Classification

Rank	Bigeye thresher	Sparsetooth dogfish
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class	Chondrichthyes (Cartilaginous Fish)	Elasmobranchii
Order	Lamniformes (Mackerel Sharks)	Squaliformes (Squaliformes)
Family	Alopiidae	Somniosidae
Genus	Alopias	Scymnodalatias
Species	Alopias pelagicus	Scymnodalatias oligodon

Evolutionary Relationship

Bigeye thresher and Sparsetooth dogfish share a common ancestor at the Phylum level: Chordata. (Chordates)

Conservation Status

Bigeye thresher

EN — Endangered

Sparsetooth dogfish

LC — Least Concern

Physical Characteristics

Attribute	Bigeye thresher	Sparsetooth dogfish
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Bigeye thresher

Habitat

Typically found in marine environments from coastal waters to deep ocean.

Range

Distributed across Colombia and Taiwan. Currently classified as Endangered on the IUCN Red List, this species faces significant conservation challenges across its range.

Sparsetooth dogfish

Habitat

Native to South America, inhabiting ecosystems characteristic of the region.

Range

Found in Chile.

Bigeye thresher

The Bigeye thresher (Alopias pelagicus) is a species in the genus Alopias. It is currently classified as Endangered on the IUCN Red List. Typically found in marine environments from coastal waters to deep ocean.