Brindled Flat-body vs Common Bithynia

Agonopterix arenella compared with Bithynia tentaculata

Taxonomic Classification

Rank	Brindled Flat-body	Common Bithynia
Kingdom same	Animalia (動物)	Animalia (動物)
Phylum	Arthropoda (節足動物)	Mollusca (軟体動物)
Class	Insecta (昆虫)	Gastropoda (腹足綱)
Order	Lepidoptera (チョウ目)	Littorinimorpha (タマキビガイ下目)
Family	Depressariidae	Bithyniidae
Genus	Agonopterix	Bithynia
Species	Agonopterix arenella	Bithynia tentaculata

Evolutionary Relationship

Brindled Flat-body and Common Bithynia share a common ancestor at the Kingdom level: Animalia. (動物)

Conservation Status

Brindled Flat-body

LC — Least Concern

Common Bithynia

LC — Least Concern

Physical Characteristics

Attribute	Brindled Flat-body	Common Bithynia
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Brindled Flat-body

Habitat

Typically found in virtually all terrestrial and freshwater habitats.

Range

Distributed across Belgium, Denmark, Norway, and Sweden.

Common Bithynia

Habitat

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

Range

Distributed across Belgium, Denmark, Norway, Sweden, and United States.

Brindled Flat-body

The Brindled Flat-body (Agonopterix arenella) is a species in the genus Agonopterix. It is currently classified as Least Concern on the IUCN Red List. Typically found in virtually all terrestrial and freshwater habitats.

Common Bithynia

The common bithynia (<em>Bithynia tentaculata</em>) is a freshwater gastropod snail belonging to the family Bithyniidae. It is classified as Least Concern on the IUCN Red List and has been recorded across terrestrial and aquatic habitats in Belgium, Denmark, Norway, Sweden, and the United States. <em>Bithynia tentaculata</em> typically inhabits slow-moving or still freshwater environments such as lakes, ponds, canals, and rivers, often on muddy or sandy substrates where organic material is abundant. The species has a distinctive operculum that seals the shell opening, providing protection against desiccation and predators. It typically feeds by grazing on algae, detritus, and biofilms on submerged surfaces. The common bithynia serves as an intermediate host for several trematode parasites, making it ecologically significant in freshwater food webs and parasite life cycles. Biological traits of this species remain poorly documented in the scientific literature.

Shared Countries

Both species can be found in 4 countries:

🇧🇪 Belgium 🇩🇰 Denmark 🇳🇴 Norway 🇸🇪 Sweden