Blackthorn Dotty vs Brook Floater

Polystigma rubrum compared with Alasmidonta varicosa

Key Differences

• Blackthorn Dotty is Least Concern while Brook Floater is Vulnerable.

Taxonomic Classification

Rank	Blackthorn Dotty	Brook Floater
Kingdom	Fungi (Fungi)	Animalia (Animals)
Phylum	Ascomycota (Sac Fungi)	Mollusca (Mollusks)
Class	Sordariomycetes (Sordariomycetes)	Bivalvia (Bivalvia)
Order	Phyllachorales (Phyllachorales)	Unionida (Unionida)
Family	Phyllachoraceae	Unionidae
Genus	Polystigma	Alasmidonta
Species	Polystigma rubrum	Alasmidonta varicosa

Conservation Status

Blackthorn Dotty

LC — Least Concern

Brook Floater

VU — Vulnerable

Physical Characteristics

Attribute	Blackthorn Dotty	Brook Floater
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Blackthorn Dotty

Habitat

Native to Europe, inhabiting ecosystems characteristic of the region.

Range

Distributed across Denmark, Norway, and Sweden.

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.

Blackthorn Dotty

The Blackthorn Dotty (Polystigma rubrum) is a species in the genus Polystigma. It is currently classified as Least Concern on the IUCN Red List. Distributed across Denmark, Norway, and Sweden.

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.