coastal arrow worm vs loup

Parasagitta setosa compared with Canis lupus

Key Differences

• coastal arrow worm is Not Evaluated while loup is Critically Endangered.

Taxonomic Classification

Rank	coastal arrow worm	loup
Kingdom same	Animalia (animal)	Animalia (animal)
Phylum	Chaetognatha (vers fléchés)	Chordata (Chordates)
Class	Sagittoidea (Sagittoidea)	Mammalia (mammifères)
Order	Aphragmophora (Aphragmophora)	Carnivora (carnivores)
Family	Sagittidae	Canidae (Dogs & Wolves)
Genus	Parasagitta	Canis (Dogs & Wolves)
Species	Parasagitta setosa	Canis lupus

Evolutionary Relationship

coastal arrow worm and loup share a common ancestor at the Kingdom level: Animalia. (animal)

Conservation Status

coastal arrow worm

NE — Not Evaluated

loup

CR — Critically Endangered

Population: ~300.0K

Trend: Stable →

Physical Characteristics

Attribute	coastal arrow worm	loup
Diet	—	Carnivore
Average Lifespan	—	13 years
Average Length	—	1.6 m
Average Weight	—	45.0 kg

Habitat & Geographic Range

coastal arrow worm

Habitat

Native to Europe, inhabiting ecosystems characteristic of the region.

Range

Distributed across Denmark, Norway, and Russia.

loup

Habitat

Found across multiple habitat types including tropical and subtropical moist broadleaf forests, deserts and xeric shrublands, and tropical and subtropical dry broadleaf forests, among 13 distinct biome types. Populations are also found in montane and highland environments at higher elevations.

Range

Widely distributed across Africa (Seychelles), Asia (Japan), Europe (5 countries), North America (7 countries), Oceania and the Pacific (Marshall Islands, Vanuatu), and South America (5 countries). Currently classified as Critically Endangered on the IUCN Red List, this species faces significant conservation challenges across its range.

coastal arrow worm

Parasagitta setosa, the coastal arrow worm, is a chaetognath in the family Sagittidae inhabiting the coastal and neritic waters of the northeastern Atlantic Ocean and adjacent North Sea and Baltic Sea, with confirmed records from Denmark, Norway, and Russia. Arrow worms are small, transparent, torpedo-shaped marine invertebrates typically 1–5 centimeters long, and despite their common name, are neither worms nor closely related to any familiar animal group; they form their own phylum, Chaetognatha, comprising around 120 species. Parasagitta setosa is a predatory planktonic species, using stiff bristle-like grasping spines flanking its mouth to seize copepods, small fish larvae, and other zooplankton that form the bulk of its diet. It occupies neritic plankton communities, often occurring in brackish coastal waters and estuaries where many arrow worm species cannot tolerate reduced salinity. The species serves as an important prey item for fish including herring and sprat and functions as a significant link in coastal marine food webs. Arrow worm phylogenetic position has been debated extensively; molecular evidence places them near the base of protostome animals. The species is Not Evaluated by the IUCN, as marine zooplankton populations are rarely assessed due to monitoring challenges.

loup

The most widely distributed wild canid, gray wolves range from North America across Eurasia in diverse habitats including tundra, forests, and grasslands. Highly social animals living in family packs led by a dominant breeding pair. As keystone predators, wolves regulate prey populations and profoundly shape ecosystem structure, as demonstrated by their reintroduction in Yellowstone. Once heavily persecuted, populations are recovering in many regions.

Shared Countries

Both species can be found in 3 countries:

🇩🇰 Denmark 🇳🇴 Norway 🇷🇺 Russia