Brook Floater vs small tortoiseshell

Alasmidonta varicosa compared with Aglais urticae

Key Differences

• Brook Floater is Vulnerable while small tortoiseshell is Near Threatened.

Taxonomic Classification

Rank	Brook Floater	small tortoiseshell
Kingdom same	Animalia (動物)	Animalia (動物)
Phylum	Mollusca (軟体動物)	Arthropoda (節足動物)
Class	Bivalvia (二枚貝)	Insecta (昆虫)
Order	Unionida (イシガイ目)	Lepidoptera (チョウ目)
Family	Unionidae	Nymphalidae (Brush-footed Butterflies)
Genus	Alasmidonta	Aglais
Species	Alasmidonta varicosa	Aglais urticae

Evolutionary Relationship

Brook Floater and small tortoiseshell share a common ancestor at the Kingdom level: Animalia. (動物)

Conservation Status

Brook Floater

VU — Vulnerable

small tortoiseshell

NT — Near Threatened

Physical Characteristics

Attribute	Brook Floater	small tortoiseshell
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Brook Floater

Habitat

Native to North America, inhabiting ecosystems characteristic of the region.

Range

Found in United States. Currently classified as Vulnerable on the IUCN Red List, this species faces significant conservation challenges across its range.

small tortoiseshell

Habitat

Typically found in virtually all terrestrial and freshwater habitats.

Range

Found across Europe (41 countries). Listed as Near Threatened, this species requires ongoing monitoring to prevent population decline.

Brook Floater

The Brook Floater (Alasmidonta varicosa) is a species in the genus Alasmidonta. It is currently classified as Vulnerable on the IUCN Red List. Native to North America, inhabiting ecosystems characteristic of the region.

small tortoiseshell

スモールトータスシェル(Aglais urticae)はIUCNレッドリストで準絶滅危惧(NT)に分類されている。絶滅危惧種に分類される一歩手前の段階で、保全措置がなければ脆弱になる可能性のある個体群を持つ。