Atlantic Deep-sea Lobster vs common sea hare

Acanthacaris caeca compared with Aplysia punctata

Taxonomic Classification

Rank	Atlantic Deep-sea Lobster	common sea hare
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum	Arthropoda (Arthropods)	Mollusca (Mollusks)
Class	Malacostraca (Crustaceans)	Gastropoda (Gastropoda)
Order	Decapoda (Decapoda)	Aplysiida (Aplysiida)
Family	Nephropidae	Aplysiidae
Genus	Acanthacaris	Aplysia
Species	Acanthacaris caeca	Aplysia punctata

Evolutionary Relationship

Atlantic Deep-sea Lobster and common sea hare share a common ancestor at the Kingdom level: Animalia. (Animals)

Conservation Status

Atlantic Deep-sea Lobster

LC — Least Concern

common sea hare

LC — Least Concern

Physical Characteristics

Attribute	Atlantic Deep-sea Lobster	common sea hare
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Atlantic Deep-sea Lobster

Habitat

Typically found in marine, freshwater, and terrestrial environments.

common sea hare

Habitat

Typically found in terrestrial and aquatic habitats including forests and freshwater.

Range

Distributed across Denmark, Norway, Portugal, and Sweden.

Atlantic Deep-sea Lobster

The Atlantic Deep-sea Lobster (Acanthacaris caeca) is a species in the genus Acanthacaris. It is currently classified as Least Concern on the IUCN Red List. Typically found in marine, freshwater, and terrestrial environments.

common sea hare

<em>Aplysia punctata</em>, the common sea hare, is a large opisthobranch sea slug in the family Aplysiidae, order Aplysiida, found in the northeastern Atlantic Ocean and Mediterranean Sea, with confirmed records from Denmark, Norway, Portugal, and Sweden. This species typically inhabits shallow subtidal and intertidal zones with abundant macroalgae, feeding primarily on red and green algae — a diet that influences the color of the defensive purple ink it secretes when threatened. <em>Aplysia punctata</em> is a simultaneous hermaphrodite, capable of acting as both male and female during mating, and often forms mating chains involving multiple individuals. It can reach considerable size among European opisthobranch species, though body dimensions vary considerably with age and feeding conditions. The species is classified as Least Concern by the IUCN, reflecting stable populations across its coastal range. Biological traits for this species remain poorly documented in the scientific literature, including precise average data on lifespan, body length, weight, and detailed seasonal dietary patterns, though its general herbivorous feeding on macroalgae is well established.