Bent Ring Lichen vs common grey sea slug

Arctoparmelia incurva compared with Aeolidia papillosa

Key Differences

Bent Ring Lichen is Critically Endangered while common grey sea slug is Least Concern.

Taxonomic Classification

Rank	Bent Ring Lichen	common grey sea slug
Kingdom	Fungi (Fungi)	Animalia (Animals)
Phylum	Ascomycota (Sac Fungi)	Mollusca (Mollusks)
Class	Lecanoromycetes (Lecanoromycetes)	Gastropoda (Gastropoda)
Order	Lecanorales (Lecanorales)	Nudibranchia (Nudibranchia)
Family	Parmeliaceae	Aeolidiidae
Genus	Arctoparmelia	Aeolidia
Species	Arctoparmelia incurva	Aeolidia papillosa

Conservation Status

Bent Ring Lichen

CR — Critically Endangered

common grey sea slug

LC — Least Concern

Physical Characteristics

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

Habitat & Geographic Range

Bent Ring Lichen

Habitat

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

Range

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

Bent Ring Lichen

The Bent Ring Lichen (Arctoparmelia incurva) is a species in the genus Arctoparmelia. It is currently classified as Critically Endangered on the IUCN Red List. Native to Europe and North America, 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.