common grey sea slug vs Split-Peg Lichen

Aeolidia papillosa compared with Cladonia cariosa

Key Differences

common grey sea slug is Least Concern while Split-Peg Lichen is Endangered.

Taxonomic Classification

Rank	common grey sea slug	Split-Peg Lichen
Kingdom	Animalia (Animals)	Fungi (Fungi)
Phylum	Mollusca (Mollusks)	Ascomycota (Sac Fungi)
Class	Gastropoda (Gastropoda)	Lecanoromycetes (Lecanoromycetes)
Order	Nudibranchia (Nudibranchia)	Lecanorales (Lecanorales)
Family	Aeolidiidae	Cladoniaceae
Genus	Aeolidia	Cladonia
Species	Aeolidia papillosa	Cladonia cariosa

Conservation Status

common grey sea slug

LC — Least Concern

Split-Peg Lichen

EN — Endangered

Physical Characteristics

Attribute	common grey sea slug	Split-Peg Lichen
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.

Split-Peg Lichen

Habitat

Native to Europe and North America, inhabiting ecosystems characteristic of the region.

Range

Distributed across Denmark, Norway, Portugal, Sweden, and United States. Currently classified as Endangered on the IUCN Red List, this species faces significant conservation challenges across its range.

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.