Black Lichen vs common grey sea slug

Lichina pygmaea compared with Aeolidia papillosa

Key Differences

Black Lichen is Extinct while common grey sea slug is Least Concern.

Taxonomic Classification

Rank	Black Lichen	common grey sea slug
Kingdom	Fungi (Fungi)	Animalia (Animals)
Phylum	Ascomycota (Sac Fungi)	Mollusca (Mollusks)
Class	Lichinomycetes (Lichinomycetes)	Gastropoda (Gastropoda)
Order	Lichinales (Lichinales)	Nudibranchia (Nudibranchia)
Family	Lichinaceae	Aeolidiidae
Genus	Lichina	Aeolidia
Species	Lichina pygmaea	Aeolidia papillosa

Conservation Status

Black Lichen

EX — Extinct

common grey sea slug

LC — Least Concern

Physical Characteristics

Attribute	Black Lichen	common grey sea slug
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Black Lichen

Habitat

Native to Europe, inhabiting ecosystems characteristic of the region.

Range

Distributed across Denmark, Norway, Portugal, and Sweden.

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.

Black Lichen

The Black Lichen (Lichina pygmaea) is a species in the genus Lichina. It is currently classified as Extinct on the IUCN Red List. Native to Europe, inhabiting ecosystems characteristic of the region. Its geographic range spans Distributed across Denmark, Norway, Portugal, and Sweden.

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.