Hooded seal vs

Cystophora cristata compared with Trichormus variabilis

Key Differences

• Hooded seal is Endangered while is Not Evaluated.

Taxonomic Classification

Rank	Hooded seal
Kingdom	Animalia (Animals)	Bacteria (Bacteria)
Phylum	Chordata (Chordates)	Cyanobacteria (Cyanobacteria)
Class	Mammalia (Mammals)	Cyanobacteriia
Order	Pinnipedia (Seals & Sea Lions)	Cyanobacteriales
Family	Phocidae (True Seals)	Nostocaceae
Genus	Cystophora	Trichormus
Species	Cystophora cristata	Trichormus variabilis

Conservation Status

Hooded seal

EN — Endangered

NE — Not Evaluated

Physical Characteristics

Attribute	Hooded seal
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Hooded seal

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Range

Distributed across Denmark, Norway, and Portugal. Currently classified as Endangered on the IUCN Red List, this species faces significant conservation challenges across its range.

Habitat

Native to Europe, inhabiting ecosystems characteristic of the region.

Range

Distributed across Denmark, Norway, and Sweden.

Trichormus variabilis is a filamentous, nitrogen-fixing cyanobacterium in the family Nostocaceae. It forms heterocysts — specialized nitrogen-fixing cells — within its trichomes and is found in freshwater, soil, and symbiotic associations. Its conservation status is not evaluated.

Shared Countries

Both species can be found in 2 countries:

🇩🇰 Denmark 🇳🇴 Norway