Blauwal vs Opalwurm

Balaenoptera musculus compared with Nephtys hombergii

Key Differences

• Blauwal is Vulnerable while Opalwurm is Least Concern.

Taxonomic Classification

Rank	Blauwal	Opalwurm
Kingdom same	Animalia (Tier)	Animalia (Tier)
Phylum	Chordata (Chordatiere)	Annelida (Ringelwürmer)
Class	Mammalia (Säugetiere)	Polychaeta (Vielborster)
Order	Cetacea (Whales & Dolphins)	Phyllodocida (Phyllodocida)
Family	Balaenopteridae (Rorquals)	Nephtyidae
Genus	Balaenoptera (Rorquals)	Nephtys
Species	Balaenoptera musculus	Nephtys hombergii

Evolutionary Relationship

Blauwal and Opalwurm share a common ancestor at the Kingdom level: Animalia. (Tier)

Conservation Status

Blauwal

VU — Vulnerable

Population: ~15.0K

Trend: Increasing ↑

Opalwurm

LC — Least Concern

Physical Characteristics

Attribute	Blauwal	Opalwurm
Diet	Carnivore	—
Average Lifespan	90 years	—
Average Length	30.0 m	—
Average Weight	150.0 t	—

Habitat & Geographic Range

Blauwal

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.

Opalwurm

Habitat

Native to Europe, inhabiting ecosystems characteristic of the region.

Range

Distributed across Denmark, Norway, and Sweden.

Blauwal

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.

Opalwurm

The Catworm (Nephtys hombergii) is a species in the genus Nephtys. It is currently classified as Least Concern on the IUCN Red List. Native to Europe, inhabiting ecosystems characteristic of the region.

Shared Countries

Both species can be found in 3 countries:

🇩🇰 Denmark 🇳🇴 Norway 🇸🇪 Sweden