Black Hagfish vs Common Seal

Eptatretus deani compared with Phoca vitulina

Key Differences

• Black Hagfish is Data Deficient while Common Seal is Near Threatened.

Taxonomic Classification

Rank	Black Hagfish	Common Seal
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class	Myxini (Myxini)	Mammalia (Mammals)
Order	Myxiniformes (Myxiniformes)	Pinnipedia (Seals & Sea Lions)
Family	Myxinidae	Phocidae (True Seals)
Genus	Eptatretus	Phoca (Harbor Seals)
Species	Eptatretus deani	Phoca vitulina

Evolutionary Relationship

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

Conservation Status

Black Hagfish

DD — Data Deficient

Common Seal

NT — Near Threatened

Population: ~500.0K

Trend: Stable →

Physical Characteristics

Attribute	Black Hagfish	Common Seal
Diet	—	Carnivore
Average Lifespan	—	30 years
Average Length	—	1.7 m
Average Weight	—	80.0 kg

Habitat & Geographic Range

Black Hagfish

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.

Black Hagfish

The Black Hagfish (Eptatretus deani) is a species in the genus Eptatretus. Its conservation status is listed as Data Deficient, indicating insufficient data for assessment.

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.