Black ghost shark vs Common Seal

Hydrolagus homonycteris compared with Phoca vitulina

Key Differences

Black ghost shark is Least Concern while Common Seal is Near Threatened.

Taxonomic Classification

Rank	Black ghost shark	Common Seal
Kingdom same	Animalia (動物)	Animalia (動物)
Phylum same	Chordata (脊索動物)	Chordata (脊索動物)
Class	Holocephali (全頭亜綱)	Mammalia (哺乳類)
Order	Chimaeriformes (ギンザメ目)	Pinnipedia (Seals & Sea Lions)
Family	Chimaeridae	Phocidae (True Seals)
Genus	Hydrolagus	Phoca (Harbor Seals)
Species	Hydrolagus homonycteris	Phoca vitulina

Evolutionary Relationship

Black ghost shark and Common Seal share a common ancestor at the Phylum level: Chordata. (脊索動物)

表示 Phylum: Chordata

Conservation Status

Black ghost shark

LC — Least Concern

Common Seal

NT — Near Threatened

Population: ~500.0K

Trend: Stable →

Physical Characteristics

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

Habitat & Geographic Range

Black ghost shark

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 ghost shark

The Black ghost shark (Hydrolagus homonycteris) is a species in the genus Hydrolagus. It is currently classified as Least Concern on the IUCN Red List.

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。