Common Seal vs Transparent tunicate

Phoca vitulina compared with Ciona savignyi

Key Differences

• Common Seal is Near Threatened while Transparent tunicate is Least Concern.

Taxonomic Classification

Rank	Common Seal	Transparent tunicate
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class	Mammalia (Mammals)	Ascidiacea (Ascidiacea)
Order	Pinnipedia (Seals & Sea Lions)	Phlebobranchia
Family	Phocidae (True Seals)	Cionidae
Genus	Phoca (Harbor Seals)	Ciona
Species	Phoca vitulina	Ciona savignyi

Evolutionary Relationship

Common Seal and Transparent tunicate share a common ancestor at the Phylum level: Chordata. (Chordates)

Conservation Status

Common Seal

NT — Near Threatened

Population: ~500.0K

Trend: Stable →

Transparent tunicate

LC — Least Concern

Physical Characteristics

Attribute	Common Seal	Transparent tunicate
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.

Transparent tunicate

Habitat

Native to Europe and North America and Oceania, inhabiting ecosystems characteristic of the region.

Range

Widely distributed across Europe (Norway, Russia), North America (Canada, United States), Oceania and the Pacific (New Zealand), and South America (Argentina).

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.

Shared Countries

Both species can be found in 3 countries:

🇳🇴 Norway 🇷🇺 Russia 🇺🇸 United States