arrow worm vs common bubble snail

Parasagitta elegans compared with Akera bullata

Key Differences

• arrow worm is Not Evaluated while common bubble snail is Least Concern.

Taxonomic Classification

Rank	arrow worm	common bubble snail
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum	Chaetognatha (arrow worms)	Mollusca (Mollusks)
Class	Sagittoidea (Sagittoidea)	Gastropoda (Gastropoda)
Order	Aphragmophora (Aphragmophora)	Aplysiida (Aplysiida)
Family	Sagittidae	Akeridae
Genus	Parasagitta	Akera
Species	Parasagitta elegans	Akera bullata

Evolutionary Relationship

arrow worm and common bubble snail share a common ancestor at the Kingdom level: Animalia. (Animals)

Conservation Status

arrow worm

NE — Not Evaluated

common bubble snail

LC — Least Concern

Physical Characteristics

Attribute	arrow worm	common bubble snail
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

arrow worm

Habitat

Native to Europe, inhabiting ecosystems characteristic of the region.

Range

Distributed across Denmark and Norway.

common bubble snail

Habitat

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

Range

Distributed across Denmark, Norway, Portugal, and Sweden.

arrow worm

The Arrow worm, Parasagitta elegans, is a species. Native to Europe, inhabiting ecosystems characteristic of the region.

common bubble snail

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:

🇩🇰 Denmark 🇳🇴 Norway