Big Finner vs Spongehead cat shark

Balaenoptera physalus compared with Apristurus spongiceps

Key Differences

• Big Finner is Endangered while Spongehead cat shark is Data Deficient.

Taxonomic Classification

Rank	Big Finner	Spongehead cat shark
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class	Mammalia (Mammals)	Chondrichthyes (Cartilaginous Fish)
Order	Cetacea (Whales & Dolphins)	Carcharhiniformes (Ground Sharks)
Family	Balaenopteridae (Rorquals)	Scyliorhinidae
Genus	Balaenoptera (Rorquals)	Apristurus
Species	Balaenoptera physalus	Apristurus spongiceps

Evolutionary Relationship

Big Finner and Spongehead cat shark share a common ancestor at the Phylum level: Chordata. (Chordates)

Conservation Status

Big Finner

EN — Endangered

Spongehead cat shark

DD — Data Deficient

Physical Characteristics

Attribute	Big Finner	Spongehead cat shark
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Big Finner

Habitat

Found across multiple habitat types including tropical and subtropical dry broadleaf forests, flooded grasslands and savannas, and montane grasslands and shrublands, among 4 distinct biome types within the Neotropic biogeographic realm.

Range

Widely distributed across Asia (Taiwan), Europe (5 countries), and South America (Colombia, Ecuador, Venezuela). Currently classified as Endangered on the IUCN Red List, this species faces significant conservation challenges across its range.

Spongehead cat shark

Habitat

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

Big Finner

Big Finner (Balaenoptera physalus) is classified as Endangered (EN) on the IUCN Red List. At high risk of extinction in the wild, with significant population decline and ongoing threats to survival.