Bigeye thresher vs Black Hagfish

Alopias pelagicus compared with Eptatretus deani

Key Differences

• Bigeye thresher is Endangered while Black Hagfish is Data Deficient.

Taxonomic Classification

Rank	Bigeye thresher	Black Hagfish
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class	Chondrichthyes (Cartilaginous Fish)	Myxini (Myxini)
Order	Lamniformes (Mackerel Sharks)	Myxiniformes (Myxiniformes)
Family	Alopiidae	Myxinidae
Genus	Alopias	Eptatretus
Species	Alopias pelagicus	Eptatretus deani

Evolutionary Relationship

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

Conservation Status

Bigeye thresher

EN — Endangered

Black Hagfish

DD — Data Deficient

Physical Characteristics

Attribute	Bigeye thresher	Black Hagfish
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.

Black Hagfish

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.

Black Hagfish

The Black Hagfish (Eptatretus deani) is a species in the genus Eptatretus. Its conservation status is listed as Data Deficient, indicating insufficient data for assessment.