Arrow-head tree snail vs common grey sea slug

Partula sagitta compared with Aeolidia papillosa

Key Differences

• Arrow-head tree snail is Extinct while common grey sea slug is Least Concern.

Taxonomic Classification

Rank	Arrow-head tree snail	common grey sea slug
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Mollusca (Mollusks)	Mollusca (Mollusks)
Class same	Gastropoda (Gastropoda)	Gastropoda (Gastropoda)
Order	Stylommatophora (Stylommatophora)	Nudibranchia (Nudibranchia)
Family	Partulidae	Aeolidiidae
Genus	Partula	Aeolidia
Species	Partula sagitta	Aeolidia papillosa

Evolutionary Relationship

Arrow-head tree snail and common grey sea slug share a common ancestor at the Class level: Gastropoda. (Gastropoda)

Conservation Status

Arrow-head tree snail

EX — Extinct

common grey sea slug

LC — Least Concern

Physical Characteristics

Attribute	Arrow-head tree snail	common grey sea slug
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Arrow-head tree snail

Habitat

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

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-head tree snail

The Arrow-head tree snail, Partula sagitta, is a species. It is currently assessed as extinct on the IUCN Red List. Typically found in terrestrial and aquatic habitats including forests and freshwater.

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.