Polar bear vs

Ursus maritimus compared with Prometheoarchaeum syntrophicum

Key Differences

• Polar bear is Vulnerable while is Not Evaluated.

Taxonomic Classification

Rank	Polar bear
Kingdom	Animalia (动物界)	Archaea (Archaea)
Phylum	Chordata (脊索动物门)	Asgardarchaeota (Asgardarchaeota)
Class	Mammalia (哺乳動物)	Lokiarchaeia
Order	Carnivora (食肉目)	CR-4
Family	Ursidae (Bears)	MK-D1
Genus	Ursus (Bears)	Prometheoarchaeum
Species	Ursus maritimus	Prometheoarchaeum syntrophicum

Conservation Status

Polar bear

VU — Vulnerable

Population: ~26.0K

Trend: Decreasing ↓

NE — Not Evaluated

Physical Characteristics

Attribute	Polar bear
Diet	Carnivore	—
Average Lifespan	25 years	—
Average Length	2.4 m	—
Average Weight	450.0 kg	—

Habitat & Geographic Range

Polar bear

Habitat

Found across multiple habitat types including temperate broadleaf and mixed forests, temperate coniferous forests, and boreal forests and taiga, among 4 distinct biome types within the Palearctic biogeographic realm. Populations are also found in montane and highland environments at higher elevations.

Range

Found in Norway. Currently classified as Vulnerable on the IUCN Red List, this species faces significant conservation challenges across its range.

Polar bear

北极熊是地球上最大的陆地食肉动物，体重可超过700千克，分布于从加拿大到俄罗斯的北极海冰区。是高度特化的海洋哺乳动物，依赖海冰捕猎环斑海豹和髯海豹。是优秀的游泳者，能够横渡广阔的开阔水域。被列为易危种，因气候变化导致北极海冰迅速减少，种群正受到严重威胁。

Prometheoarchaeum syntrophicum是Asgard古菌的成员，被提议为连接古菌域和真核生物域的关键谱系。其长且缠绕的突起以及与细菌伙伴的共营养生活方式为真核细胞起源的假说提供了信息。