Bigeye thresher vs Bladder Fern

Alopias pelagicus compared with Cystopteris fragilis

Key Differences

• Bigeye thresher is Endangered while Bladder Fern is Not Evaluated.

Taxonomic Classification

Rank	Bigeye thresher	Bladder Fern
Kingdom	Animalia (Animals)	Plantae (Plants)
Phylum	Chordata (Chordates)	Tracheophyta
Class	Chondrichthyes (Cartilaginous Fish)	Polypodiopsida (Polypodiopsida)
Order	Lamniformes (Mackerel Sharks)	Polypodiales (Polypodiales)
Family	Alopiidae	Cystopteridaceae
Genus	Alopias	Cystopteris
Species	Alopias pelagicus	Cystopteris fragilis

Conservation Status

Bigeye thresher

EN — Endangered

Bladder Fern

NE — Not Evaluated

Physical Characteristics

Attribute	Bigeye thresher	Bladder Fern
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.

Bladder Fern

Habitat

Typically found in moist, shaded forest floors and tropical canopies.

Range

Widely distributed across Asia (Taiwan), Europe (6 countries), North America (Canada, United States), and South America (Colombia).

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.

Bladder Fern

The Bladder Fern (Cystopteris fragilis) is a species in the genus Cystopteris. Typically found in moist, shaded forest floors and tropical canopies.

Shared Countries

Both species can be found in 2 countries:

🇨🇴 Colombia 🇹🇼 Taiwan