Bigeye thresher vs River Lamprey

Alopias pelagicus compared with Lampetra ayresii

Key Differences

• Bigeye thresher is Endangered while River Lamprey is Least Concern.

Taxonomic Classification

Rank	Bigeye thresher	River Lamprey
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class	Chondrichthyes (Cartilaginous Fish)	Petromyzonti (Petromyzonti)
Order	Lamniformes (Mackerel Sharks)	Petromyzontiformes (lamprey)
Family	Alopiidae	Petromyzontidae
Genus	Alopias	Lampetra
Species	Alopias pelagicus	Lampetra ayresii

Evolutionary Relationship

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

Conservation Status

Bigeye thresher

EN — Endangered

River Lamprey

LC — Least Concern

Physical Characteristics

Attribute	Bigeye thresher	River Lamprey
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.

River Lamprey

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.