Common Seal vs Stone Crayfish

Phoca vitulina compared with Austropotamobius torrentium

Key Differences

• Common Seal is Near Threatened while Stone Crayfish is Data Deficient.

Taxonomic Classification

Rank	Common Seal	Stone Crayfish
Kingdom same	Animalia (動物)	Animalia (動物)
Phylum	Chordata (脊索動物)	Arthropoda (節足動物)
Class	Mammalia (哺乳類)	Malacostraca (軟甲綱)
Order	Pinnipedia (Seals & Sea Lions)	Decapoda (十脚目)
Family	Phocidae (True Seals)	Astacidae
Genus	Phoca (Harbor Seals)	Austropotamobius
Species	Phoca vitulina	Austropotamobius torrentium

Evolutionary Relationship

Common Seal and Stone Crayfish share a common ancestor at the Kingdom level: Animalia. (動物)

Conservation Status

Common Seal

NT — Near Threatened

Population: ~500.0K

Trend: Stable →

Stone Crayfish

DD — Data Deficient

Physical Characteristics

Attribute	Common Seal	Stone Crayfish
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.

Stone Crayfish

Habitat

Typically found in marine, freshwater, and terrestrial environments.

Common Seal

最も広く分布する鰭脚類であるゴマフアザラシの近縁種・ゼニガタアザラシ（Phoca vitulina）は、北大西洋と北太平洋の温帯・亜北極沿岸に生息する。成体は最大130kgに達し、海での魚・イカ・甲殻類の捕食と海岸や岩場での休息にほぼ同じ時間を費やす。大きく表情豊かな目は低照度での水中視覚に適応している。シャチ・サメ・ホッキョクグマにとって重要な食料源である。