Bigeye thresher vs Four-Lined Silverfish

Alopias pelagicus compared with Ctenolepisma lineata

Key Differences

• Bigeye thresher is Endangered while Four-Lined Silverfish is Not Evaluated.

Taxonomic Classification

Rank	Bigeye thresher	Four-Lined Silverfish
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum	Chordata (Chordates)	Arthropoda (Arthropods)
Class	Chondrichthyes (Cartilaginous Fish)	Insecta (Insects)
Order	Lamniformes (Mackerel Sharks)	Zygentoma (Zygentoma)
Family	Alopiidae	Lepismatidae
Genus	Alopias	Ctenolepisma
Species	Alopias pelagicus	Ctenolepisma lineata

Evolutionary Relationship

Bigeye thresher and Four-Lined Silverfish share a common ancestor at the Kingdom level: Animalia. (Animals)

Conservation Status

Bigeye thresher

EN — Endangered

Four-Lined Silverfish

NE — Not Evaluated

Physical Characteristics

Attribute	Bigeye thresher	Four-Lined Silverfish
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.

Four-Lined Silverfish

Habitat

Typically found in virtually all terrestrial and freshwater habitats.

Range

Distributed across Belgium, Norway, Portugal, Sweden, and United States.

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.