Atlantic chimaera vs Bigeye thresher

Hydrolagus affinis compared with Alopias pelagicus

Key Differences

• Atlantic chimaera is Least Concern while Bigeye thresher is Endangered.

Taxonomic Classification

Rank	Atlantic chimaera	Bigeye thresher
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class	Holocephali (Holocephali)	Chondrichthyes (Cartilaginous Fish)
Order	Chimaeriformes (Chimaeriformes)	Lamniformes (Mackerel Sharks)
Family	Chimaeridae	Alopiidae
Genus	Hydrolagus	Alopias
Species	Hydrolagus affinis	Alopias pelagicus

Evolutionary Relationship

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

Conservation Status

Atlantic chimaera

LC — Least Concern

Bigeye thresher

EN — Endangered

Physical Characteristics

Attribute	Atlantic chimaera	Bigeye thresher
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Atlantic chimaera

Habitat

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

Range

Distributed across Chile and Portugal.

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.

Atlantic chimaera

The Atlantic chimaera (Hydrolagus affinis) is a species in the genus Hydrolagus. It is currently classified as Least Concern on the IUCN Red List. Native to Europe and South America, inhabiting ecosystems characteristic of the region.

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.