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 (动物界)	Animalia (动物界)
Phylum	Mollusca (软体动物门)	Arthropoda (节肢动物门)
Class	Bivalvia (双壳纲)	Insecta (昆蟲綱)
Order	Unionida (蚌目)	Lepidoptera (鱗翅目)
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. (动物界)

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

小玳瑁蛱蝶(Aglais urticae)在IUCN红色名录中被列为近危(NT)物种。接近符合受威胁种标准，如无保护措施，种群可能变得脆弱。