arrow worm vs common grey sea slug

Parasagitta elegans compared with Aeolidia papillosa

Key Differences

• arrow worm is Not Evaluated while common grey sea slug is Least Concern.

Taxonomic Classification

Rank	arrow worm	common grey sea slug
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum	Chaetognatha (arrow worms)	Mollusca (Mollusks)
Class	Sagittoidea (Sagittoidea)	Gastropoda (Gastropoda)
Order	Aphragmophora (Aphragmophora)	Nudibranchia (Nudibranchia)
Family	Sagittidae	Aeolidiidae
Genus	Parasagitta	Aeolidia
Species	Parasagitta elegans	Aeolidia papillosa

Evolutionary Relationship

arrow worm and common grey sea slug share a common ancestor at the Kingdom level: Animalia. (Animals)

Conservation Status

arrow worm

NE — Not Evaluated

common grey sea slug

LC — Least Concern

Physical Characteristics

Attribute	arrow worm	common grey sea slug
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

arrow worm

Habitat

Native to Europe, inhabiting ecosystems characteristic of the region.

Range

Distributed across Denmark and Norway.

common grey sea slug

Habitat

Typically found in terrestrial and aquatic habitats including forests and freshwater.

Range

Distributed across Belgium, Chile, Denmark, Norway, and Sweden.

arrow worm

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

common grey sea slug

<em>Aeolidia papillosa</em>, commonly known as the common grey sea slug, is a nudibranch mollusc belonging to the genus Aeolidia within the family Aeolidiidae. Despite the species name referencing terrestrial and aquatic habitats including forests and freshwater, <em>Aeolidia papillosa</em> is primarily a marine organism. Its range includes Belgium, Chile, Denmark, Norway, and Sweden, indicating a distribution across the North Atlantic and into South American waters. Common grey sea slug is assessed as Least Concern on the IUCN Red List. The species is typically found in intertidal and subtidal zones, where it preys on sea anemones and stores stinging cells from its prey in its dorsal cerata for defense. Biological traits of this species remain poorly documented in the scientific literature.

Shared Countries

Both species can be found in 2 countries:

🇩🇰 Denmark 🇳🇴 Norway