common sea hare vs Violet Crystalwort

Aplysia punctata compared with Riccia huebeneriana

Key Differences

• common sea hare is Least Concern while Violet Crystalwort is Endangered.

Taxonomic Classification

Rank	common sea hare	Violet Crystalwort
Kingdom	Animalia (hayvan)	Plantae (bitki)
Phylum	Mollusca (Yumuşakçalar)	Marchantiophyta (Ciğer otları)
Class	Gastropoda (Karından bacaklılar)	Marchantiopsida (Marchantiopsida)
Order	Aplysiida (Aplysiida)	Marchantiales (Marchantiales)
Family	Aplysiidae	Ricciaceae
Genus	Aplysia	Riccia
Species	Aplysia punctata	Riccia huebeneriana

Conservation Status

common sea hare

LC — Least Concern

Violet Crystalwort

EN — Endangered

Physical Characteristics

Attribute	common sea hare	Violet Crystalwort
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

common sea hare

Habitat

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

Range

Distributed across Denmark, Norway, Portugal, and Sweden.

Violet Crystalwort

Habitat

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

Range

Found across Europe (6 countries) and North America (United States). Currently classified as Endangered on the IUCN Red List, this species faces significant conservation challenges across its range.

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.

Shared Countries

Both species can be found in 4 countries:

🇩🇰 Denmark 🇳🇴 Norway 🇵🇹 Portugal 🇸🇪 Sweden