Common Seal vs Four-Lined Silverfish

Phoca vitulina compared with Ctenolepisma lineata

Key Differences

Common Seal is Near Threatened while Four-Lined Silverfish is Not Evaluated.

Taxonomic Classification

Rank	Common Seal	Four-Lined Silverfish
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum	Chordata (Chordates)	Arthropoda (Arthropods)
Class	Mammalia (Mammals)	Insecta (Insects)
Order	Pinnipedia (Seals & Sea Lions)	Zygentoma (Zygentoma)
Family	Phocidae (True Seals)	Lepismatidae
Genus	Phoca (Harbor Seals)	Ctenolepisma
Species	Phoca vitulina	Ctenolepisma lineata

Evolutionary Relationship

Common Seal and Four-Lined Silverfish share a common ancestor at the Kingdom level: Animalia. (Animals)

View Kingdom: Animalia

Conservation Status

Common Seal

NT — Near Threatened

Population: ~500.0K

Trend: Stable →

Four-Lined Silverfish

NE — Not Evaluated

Physical Characteristics

Attribute	Common Seal	Four-Lined Silverfish
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.

Four-Lined Silverfish

Habitat

Typically found in virtually all terrestrial and freshwater habitats.

Range

Distributed across Belgium, Norway, Portugal, Sweden, and United States.

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.