Brook Floater vs Common Three-Seeded Mercury

Alasmidonta varicosa compared with Acalypha rhomboidea

Key Differences

Brook Floater is Vulnerable while Common Three-Seeded Mercury is Not Evaluated.

Taxonomic Classification

Rank	Brook Floater	Common Three-Seeded Mercury
Kingdom	Animalia (Animals)	Plantae (Plants)
Phylum	Mollusca (Mollusks)	Magnoliophyta (Flowering Plants)
Class	Bivalvia (Bivalvia)	Magnoliopsida (Dicots)
Order	Unionida (Unionida)	Malpighiales (Malpighiales)
Family	Unionidae	Euphorbiaceae
Genus	Alasmidonta	Acalypha
Species	Alasmidonta varicosa	Acalypha rhomboidea

Conservation Status

Brook Floater

VU — Vulnerable

Common Three-Seeded Mercury

NE — Not Evaluated

Physical Characteristics

Attribute	Brook Floater	Common Three-Seeded Mercury
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 Three-Seeded Mercury

Habitat

Typically found in diverse terrestrial habitats from tropical forests to temperate regions.

Range

Distributed across Belgium, Canada, Portugal, 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.

Common Three-Seeded Mercury

<em>Acalypha rhomboidea</em>, the common three-seeded mercury, is an annual herbaceous plant in the family Euphorbiaceae, native to eastern North America and recorded from Belgium, Canada, Portugal, and the United States. It is Not Evaluated on the IUCN Red List. The plant is a common weed of disturbed habitats, cultivated fields, gardens, roadsides, and forest edges, typically growing in moist, nitrogen-rich soils. It bears rhombic to ovate leaves and small, inconspicuous flowers arranged in slender spikes, with the name reflecting the typically three-seeded fruits. As a wind-pollinated annual, it produces abundant small seeds that disperse readily. The plant has a relatively short growing season, germinating in late spring, setting seed by late summer, and senescing by autumn. It has no significant economic value but contributes to local biodiversity as a host plant for certain herbivorous insects. Biological traits such as precise plant height range, seed output, and biomass data remain poorly documented in standardized scientific assessments.