Basking shark vs Big eye thresher shark

Rhincodon typus compared with Alopias superciliosus

Key Differences

• Basking shark is Endangered while Big eye thresher shark is Vulnerable.

Taxonomic Classification

Rank	Basking shark	Big eye thresher shark
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class same	Chondrichthyes (Cartilaginous Fish)	Chondrichthyes (Cartilaginous Fish)
Order same	Lamniformes (Mackerel Sharks)	Lamniformes (Mackerel Sharks)
Family	Rhincodontidae (Whale Sharks)	Alopiidae
Genus	Rhincodon (Whale Sharks)	Alopias
Species	Rhincodon typus	Alopias superciliosus

Evolutionary Relationship

Basking shark and Big eye thresher shark share a common ancestor at the Order level: Lamniformes. (Mackerel Sharks)

Conservation Status

Basking shark

EN — Endangered

Trend: Decreasing ↓

Big eye thresher shark

VU — Vulnerable

Physical Characteristics

Attribute	Basking shark	Big eye thresher shark
Diet	Omnivore	—
Average Lifespan	100 years	—
Average Length	12.0 m	—
Average Weight	20.0 t	—

Habitat & Geographic Range

Basking shark

Habitat

Found across multiple habitat types including temperate broadleaf and mixed forests, temperate grasslands and steppes, and montane grasslands and shrublands, among 5 distinct biome types within the Neotropic biogeographic realm.

Range

Distributed across Chile, Portugal, Taiwan, and Venezuela. Currently classified as Endangered on the IUCN Red List, this species faces significant conservation challenges across its range.

Big eye thresher shark

Habitat

Typically found in marine environments from coastal waters to deep ocean.

Range

Distributed across Chile, Colombia, Portugal, Taiwan, and Venezuela. Currently classified as Vulnerable on the IUCN Red List, this species faces significant conservation challenges across its range.

Basking shark

The world's largest fish, whale sharks can exceed 12 meters and 20 tonnes, inhabiting tropical and warm temperate oceans worldwide. Despite their massive size, they are harmless filter feeders, consuming plankton, fish eggs, and small fish by swimming open-mouthed through prey-dense water. They undertake vast seasonal migrations following plankton blooms. Endangered due to fishing, boat strikes, and the live fin trade, with population declining by approximately 50% over the past 75 years.

Big eye thresher shark

The Big eye thresher shark (Alopias superciliosus) is a species in the genus Alopias. It is currently classified as Vulnerable on the IUCN Red List. Typically found in marine environments from coastal waters to deep ocean.

Shared Countries

Both species can be found in 4 countries:

🇨🇱 Chile 🇵🇹 Portugal 🇹🇼 Taiwan 🇻🇪 Venezuela