arrow worm vs blue whale

Parasagitta elegans compared with Balaenoptera musculus

Key Differences

• arrow worm is Not Evaluated while blue whale is Vulnerable.

Taxonomic Classification

Rank	arrow worm	blue whale
Kingdom same	Animalia (สัตว์)	Animalia (สัตว์)
Phylum	Chaetognatha (arrow worms)	Chordata (สัตว์มีแกนสันหลัง)
Class	Sagittoidea (Sagittoidea)	Mammalia (สัตว์เลี้ยงลูกด้วยน้ำนม)
Order	Aphragmophora (Aphragmophora)	Cetacea (Whales & Dolphins)
Family	Sagittidae	Balaenopteridae (Rorquals)
Genus	Parasagitta	Balaenoptera (Rorquals)
Species	Parasagitta elegans	Balaenoptera musculus

Evolutionary Relationship

arrow worm and blue whale share a common ancestor at the Kingdom level: Animalia. (สัตว์)

Conservation Status

arrow worm

NE — Not Evaluated

blue whale

VU — Vulnerable

Population: ~15.0K

Trend: Increasing ↑

Physical Characteristics

Attribute	arrow worm	blue whale
Diet	—	Carnivore
Average Lifespan	—	90 years
Average Length	—	30.0 m
Average Weight	—	150.0 t

Habitat & Geographic Range

arrow worm

Habitat

Native to Europe, inhabiting ecosystems characteristic of the region.

Range

Distributed across Denmark and Norway.

blue whale

Habitat

Found across multiple habitat types including tropical and subtropical moist broadleaf forests, tropical and subtropical dry broadleaf forests, and tropical and subtropical grasslands and savannas, among 11 distinct biome types. Populations are also found in montane and highland environments at higher elevations.

Range

Widely distributed across Asia (Taiwan), Europe (4 countries), and South America (Colombia, Ecuador). Currently classified as Vulnerable on the IUCN Red List, this species faces significant conservation challenges across its range.

arrow worm

The Arrow worm, Parasagitta elegans, is a species. Native to Europe, inhabiting ecosystems characteristic of the region.

blue whale

The largest animal ever known to have lived on Earth, blue whales can reach 33 meters and 200 tonnes — their hearts alone weigh as much as a small car. Found in all oceans, they migrate between polar feeding grounds and tropical breeding areas. Filter feeders consuming up to 4 tonnes of krill daily. Endangered, with global populations estimated at 10,000–25,000 after near-extinction from 20th-century whaling.

Shared Countries

Both species can be found in 2 countries:

🇩🇰 Denmark 🇳🇴 Norway