common grey sea slug vs Common Least Skipper

Aeolidia papillosa compared with Ancyloxypha numitor

Taxonomic Classification

Rank	common grey sea slug	Common Least Skipper
Kingdom same	Animalia (동물)	Animalia (동물)
Phylum	Mollusca (연체동물)	Arthropoda (절지동물)
Class	Gastropoda (복족강)	Insecta (곤충)
Order	Nudibranchia (갯민숭달팽이)	Lepidoptera (나비목)
Family	Aeolidiidae	Hesperiidae
Genus	Aeolidia	Ancyloxypha
Species	Aeolidia papillosa	Ancyloxypha numitor

Evolutionary Relationship

common grey sea slug and Common Least Skipper share a common ancestor at the Kingdom level: Animalia. (동물)

Conservation Status

common grey sea slug

LC — Least Concern

Common Least Skipper

LC — Least Concern

Physical Characteristics

Attribute	common grey sea slug	Common Least Skipper
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.

Common Least Skipper

Habitat

Typically found in virtually all terrestrial and freshwater habitats.

Range

Distributed across Canada and United States.

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.

Common Least Skipper

The Common Least Skipper (<em>Ancyloxypha numitor</em>) is a small butterfly in the family Hesperiidae, classified as Least Concern on the IUCN Red List. It is native to Canada and the United States, where it typically inhabits virtually all terrestrial and freshwater habitats within its range, showing a particular affinity for moist, grassy areas near water. The species is among the smallest skippers in North America, characterized by orange and brown wing coloration and a rapid, low-flying flight pattern close to vegetation. Adults typically nectar on small flowers while larvae feed on grasses, particularly those in wet meadows, marshes, stream margins, and disturbed grassy areas. The Common Least Skipper is frequently observed in wetland margins, wet prairies, and roadsides with rank grass growth. Its wide distribution across North America and habitat generalism across moist grassland and wetland types support its stable population and Least Concern conservation status. Biological traits of this species remain poorly documented in the scientific literature.