common grey sea slug vs Fake round ray

Aeolidia papillosa compared with Urotrygon simulatrix

Key Differences

• common grey sea slug is Least Concern while Fake round ray is Vulnerable.

Taxonomic Classification

Rank	common grey sea slug	Fake round ray
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum	Mollusca (Mollusks)	Chordata (Chordates)
Class	Gastropoda (Gastropoda)	Elasmobranchii
Order	Nudibranchia (Nudibranchia)	Myliobatiformes (Myliobatiformes)
Family	Aeolidiidae	Urotrygonidae
Genus	Aeolidia	Urotrygon
Species	Aeolidia papillosa	Urotrygon simulatrix

Evolutionary Relationship

common grey sea slug and Fake round ray share a common ancestor at the Kingdom level: Animalia. (Animals)

Conservation Status

common grey sea slug

LC — Least Concern

Fake round ray

VU — Vulnerable

Physical Characteristics

Attribute	common grey sea slug	Fake round ray
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

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.

Fake round ray

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.