Bigeye thresher vs Eastern Willow Spreadwing

Alopias pelagicus compared with Chalcolestes parvidens

Key Differences

• Bigeye thresher is Endangered while Eastern Willow Spreadwing is Least Concern.

Taxonomic Classification

Rank	Bigeye thresher	Eastern Willow Spreadwing
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum	Chordata (Chordates)	Arthropoda (Arthropods)
Class	Chondrichthyes (Cartilaginous Fish)	Insecta (Insects)
Order	Lamniformes (Mackerel Sharks)	Odonata (Odonata)
Family	Alopiidae	Lestidae
Genus	Alopias	Chalcolestes
Species	Alopias pelagicus	Chalcolestes parvidens

Evolutionary Relationship

Bigeye thresher and Eastern Willow Spreadwing share a common ancestor at the Kingdom level: Animalia. (Animals)

Conservation Status

Bigeye thresher

EN — Endangered

Eastern Willow Spreadwing

LC — Least Concern

Physical Characteristics

Attribute	Bigeye thresher	Eastern Willow Spreadwing
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.

Eastern Willow Spreadwing

Habitat

Typically found in virtually all terrestrial and freshwater habitats.

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.