Bigeye thresher vs Swell shark

Alopias pelagicus compared with Cephaloscyllium ventriosum

Key Differences

• Bigeye thresher is Endangered while Swell shark is Least Concern.

Taxonomic Classification

Rank	Bigeye thresher	Swell shark
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class same	Chondrichthyes (Cartilaginous Fish)	Chondrichthyes (Cartilaginous Fish)
Order	Lamniformes (Mackerel Sharks)	Carcharhiniformes (Ground Sharks)
Family	Alopiidae	Scyliorhinidae
Genus	Alopias	Cephaloscyllium
Species	Alopias pelagicus	Cephaloscyllium ventriosum

Evolutionary Relationship

Bigeye thresher and Swell shark share a common ancestor at the Class level: Chondrichthyes. (Cartilaginous Fish)

Conservation Status

Bigeye thresher

EN — Endangered

Swell shark

LC — Least Concern

Physical Characteristics

Attribute	Bigeye thresher	Swell shark
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.

Swell shark

Habitat

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

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.