brook lamprey vs common sea hare

Lampetra planeri compared with Aplysia punctata

Key Differences

• brook lamprey is Vulnerable while common sea hare is Least Concern.

Taxonomic Classification

Rank	brook lamprey	common sea hare
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum	Chordata (Chordates)	Mollusca (Mollusks)
Class	Petromyzonti (Petromyzonti)	Gastropoda (Gastropoda)
Order	Petromyzontiformes (lamprey)	Aplysiida (Aplysiida)
Family	Petromyzontidae	Aplysiidae
Genus	Lampetra	Aplysia
Species	Lampetra planeri	Aplysia punctata

Evolutionary Relationship

brook lamprey and common sea hare share a common ancestor at the Kingdom level: Animalia. (Animals)

Conservation Status

brook lamprey

VU — Vulnerable

common sea hare

LC — Least Concern

Physical Characteristics

Attribute	brook lamprey	common sea hare
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

brook lamprey

Habitat

Native to Europe, inhabiting ecosystems characteristic of the region.

Range

Distributed across Belgium, Denmark, Norway, and Sweden. Currently classified as Vulnerable on the IUCN Red List, this species faces significant conservation challenges across its range.

common sea hare

Habitat

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

Range

Distributed across Denmark, Norway, Portugal, and Sweden.

brook lamprey

The Brook Lamprey (Lampetra planeri) is a species in the genus Lampetra. It is currently classified as Vulnerable on the IUCN Red List. Native to Europe, inhabiting ecosystems characteristic of the region.

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 3 countries:

🇩🇰 Denmark 🇳🇴 Norway 🇸🇪 Sweden