Common Seal vs Leopard-spotted swellshark

Phoca vitulina compared with Cephaloscyllium fasciatum

Key Differences

Common Seal is Near Threatened while Leopard-spotted swellshark is Critically Endangered.

Taxonomic Classification

Rank	Common Seal	Leopard-spotted swellshark
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class	Mammalia (Mammals)	Chondrichthyes (Cartilaginous Fish)
Order	Pinnipedia (Seals & Sea Lions)	Carcharhiniformes (Ground Sharks)
Family	Phocidae (True Seals)	Scyliorhinidae
Genus	Phoca (Harbor Seals)	Cephaloscyllium
Species	Phoca vitulina	Cephaloscyllium fasciatum

Evolutionary Relationship

Common Seal and Leopard-spotted swellshark share a common ancestor at the Phylum level: Chordata. (Chordates)

View Phylum: Chordata

Conservation Status

Common Seal

NT — Near Threatened

Population: ~500.0K

Trend: Stable →

Leopard-spotted swellshark

CR — Critically Endangered

Physical Characteristics

Attribute	Common Seal	Leopard-spotted swellshark
Diet	Carnivore	—
Average Lifespan	30 years	—
Average Length	1.7 m	—
Average Weight	80.0 kg	—

Habitat & Geographic Range

Common Seal

Habitat

Typically found in diverse ecosystems where prey species are available.

Range

Found across Europe (7 countries) and North America (United States). Listed as Near Threatened, this species requires ongoing monitoring to prevent population decline.

Leopard-spotted swellshark

Habitat

Inhabits tropical and subtropical moist broadleaf forests within the Indomalayan biogeographic realm.

Range

Found in Taiwan. Currently classified as Critically Endangered on the IUCN Red List, this species faces significant conservation challenges across its range.

Common Seal

The most widely distributed pinniped, harbor seals inhabit temperate and subarctic coastal waters of both the North Atlantic and North Pacific. Adults reach up to 130 kg and spend roughly equal time at sea hunting fish, squid, and crustaceans and hauling out on beaches or rocks to rest. Their large, expressive eyes are adapted for underwater vision in low light. Harbor seals are a critical food source for orcas, sharks, and polar bears.