Brittle Bladderfern vs common grey sea slug

Cystopteris tenuis compared with Aeolidia papillosa

Key Differences

• Brittle Bladderfern is Not Evaluated while common grey sea slug is Least Concern.

Taxonomic Classification

Rank	Brittle Bladderfern	common grey sea slug
Kingdom	Plantae (Plants)	Animalia (Animals)
Phylum	Tracheophyta	Mollusca (Mollusks)
Class	Polypodiopsida (Polypodiopsida)	Gastropoda (Gastropoda)
Order	Polypodiales (Polypodiales)	Nudibranchia (Nudibranchia)
Family	Cystopteridaceae	Aeolidiidae
Genus	Cystopteris	Aeolidia
Species	Cystopteris tenuis	Aeolidia papillosa

Conservation Status

Brittle Bladderfern

NE — Not Evaluated

common grey sea slug

LC — Least Concern

Physical Characteristics

Attribute	Brittle Bladderfern	common grey sea slug
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Brittle Bladderfern

Habitat

Typically found in moist, shaded forest floors and tropical canopies.

Range

Distributed across Canada and United States.

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.

Brittle Bladderfern

The Brittle Bladderfern (Cystopteris tenuis) is a species in the genus Cystopteris. Typically found in moist, shaded forest floors and tropical canopies.

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.