Gemeine Kugelschnecke vs Schwarze Waldkreuzspinne

Akera bullata compared with Araneus saevus

Key Differences

• Gemeine Kugelschnecke is Least Concern while Schwarze Waldkreuzspinne is Near Threatened.

Taxonomic Classification

Rank	Gemeine Kugelschnecke	Schwarze Waldkreuzspinne
Kingdom same	Animalia (Tier)	Animalia (Tier)
Phylum	Mollusca (Weichtiere)	Arthropoda (Gliederfüßer)
Class	Gastropoda (Schnecken)	Arachnida (Spinnentiere)
Order	Aplysiida (Aplysiida)	Araneae (Webspinnen)
Family	Akeridae	Araneidae
Genus	Akera	Araneus
Species	Akera bullata	Araneus saevus

Evolutionary Relationship

Gemeine Kugelschnecke and Schwarze Waldkreuzspinne share a common ancestor at the Kingdom level: Animalia. (Tier)

Conservation Status

Gemeine Kugelschnecke

LC — Least Concern

Schwarze Waldkreuzspinne

NT — Near Threatened

Physical Characteristics

Attribute	Gemeine Kugelschnecke	Schwarze Waldkreuzspinne
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Gemeine Kugelschnecke

Habitat

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

Range

Distributed across Denmark, Norway, Portugal, and Sweden.

Schwarze Waldkreuzspinne

Habitat

Typically found in terrestrial habitats from forests to deserts.

Range

Distributed across Canada, Norway, Sweden, and United States. Listed as Near Threatened, this species requires ongoing monitoring to prevent population decline.

Gemeine Kugelschnecke

The common bubble snail (<em>Akera bullata</em>) is a marine gastropod mollusc found in the coastal waters of Denmark, Norway, Portugal, and Sweden. This species typically inhabits terrestrial and aquatic environments including forests and freshwater-adjacent marine areas, often occurring in shallow subtidal and intertidal zones of temperate European seas. It is classified as Least Concern on the IUCN Red List. As a member of the family Akeridae, the common bubble snail is characterized by its thin, fragile shell and its ability to swim briefly by flapping its large, wing-like parapodia. The species often forages on algae and detritus in sandy and muddy seafloor habitats, particularly in sheltered bays and estuaries. The common bubble snail typically aggregates in large numbers during the spawning season, producing gelatinous egg masses. Biological traits of this species remain poorly documented in the scientific literature.

Shared Countries

Both species can be found in 2 countries:

🇳🇴 Norway 🇸🇪 Sweden