common bubble snail vs Rootless Duckweed

Akera bullata compared with Wolffia arrhiza

Key Differences

common bubble snail is Least Concern while Rootless Duckweed is Endangered.

Taxonomic Classification

Rank	common bubble snail	Rootless Duckweed
Kingdom	Animalia (動物)	Plantae (植物)
Phylum	Mollusca (軟体動物)	Magnoliophyta (被子植物門)
Class	Gastropoda (腹足綱)	Liliopsida (単子葉植物綱)
Order	Aplysiida (Aplysiida)	Alismatales (オモダカ目)
Family	Akeridae	Araceae
Genus	Akera	Wolffia
Species	Akera bullata	Wolffia arrhiza

Conservation Status

common bubble snail

LC — Least Concern

Rootless Duckweed

EN — Endangered

Physical Characteristics

Attribute	common bubble snail	Rootless Duckweed
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

common bubble snail

Habitat

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

Range

Distributed across Denmark, Norway, Portugal, and Sweden.

Rootless Duckweed

Habitat

Found across multiple habitat types including tropical and subtropical moist broadleaf forests, temperate broadleaf and mixed forests, and temperate coniferous forests, among 4 distinct biome types spanning the Indomalayan and Oceanian and Palearctic realms. Populations are also found in montane and highland environments at higher elevations.

Range

Widely distributed across Asia (Japan), Europe (10 countries), North America (Canada), and South America (Brazil). Currently classified as Endangered on the IUCN Red List, this species faces significant conservation challenges across its range.

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.