Brook Floater vs common hydra

Alasmidonta varicosa compared with Hydra vulgaris

Key Differences

• Brook Floater is Vulnerable while common hydra is Not Evaluated.

Taxonomic Classification

Rank	Brook Floater	common hydra
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum	Mollusca (Mollusks)	Cnidaria (Cnidarians)
Class	Bivalvia (Bivalvia)	Hydrozoa (Hydrozoa)
Order	Unionida (Unionida)	Anthoathecata (Anthoathecata)
Family	Unionidae	Hydridae
Genus	Alasmidonta	Hydra
Species	Alasmidonta varicosa	Hydra vulgaris

Evolutionary Relationship

Brook Floater and common hydra share a common ancestor at the Kingdom level: Animalia. (Animals)

Conservation Status

Brook Floater

VU — Vulnerable

common hydra

NE — Not Evaluated

Physical Characteristics

Attribute	Brook Floater	common hydra
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.

common hydra

Habitat

Native to Europe, inhabiting ecosystems characteristic of the region.

Range

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.

common hydra

<em>Hydra vulgaris</em>, commonly known as the common hydra, is a small freshwater cnidarian in the family Hydridae. Its conservation status has not been formally evaluated by the IUCN. The species is recorded from Denmark, Norway, and Sweden, with its native range understood to encompass Europe broadly. It typically inhabits slow-moving or still freshwater bodies such as ponds, lakes, and streams, where it attaches to aquatic vegetation or submerged substrates. The common hydra is notable for its remarkable regenerative capabilities and has been the subject of substantial biological research. Diet information for this species is not available in current records. Biological traits of this species remain poorly documented in the scientific literature.