Brook Floater vs Four-Lined Silverfish

Alasmidonta varicosa compared with Ctenolepisma lineata

Key Differences

• Brook Floater is Vulnerable while Four-Lined Silverfish is Not Evaluated.

Taxonomic Classification

Rank	Brook Floater	Four-Lined Silverfish
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum	Mollusca (Mollusks)	Arthropoda (Arthropods)
Class	Bivalvia (Bivalvia)	Insecta (Insects)
Order	Unionida (Unionida)	Zygentoma (Zygentoma)
Family	Unionidae	Lepismatidae
Genus	Alasmidonta	Ctenolepisma
Species	Alasmidonta varicosa	Ctenolepisma lineata

Evolutionary Relationship

Brook Floater and Four-Lined Silverfish share a common ancestor at the Kingdom level: Animalia. (Animals)

Conservation Status

Brook Floater

VU — Vulnerable

Four-Lined Silverfish

NE — Not Evaluated

Physical Characteristics

Attribute	Brook Floater	Four-Lined Silverfish
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.

Four-Lined Silverfish

Habitat

Typically found in virtually all terrestrial and freshwater habitats.

Range

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

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.

Shared Countries

Both species can be found in 1 countries:

🇺🇸 United States