Brook Floater vs Cliff Mason Bee

Alasmidonta varicosa compared with Osmia xanthomelana

Key Differences

• Brook Floater is Vulnerable while Cliff Mason Bee is Not Evaluated.

Taxonomic Classification

Rank	Brook Floater	Cliff Mason Bee
Kingdom same	Animalia (животные)	Animalia (животные)
Phylum	Mollusca (моллюски)	Arthropoda (членистоногие)
Class	Bivalvia (двустворчатые)	Insecta (насекомые)
Order	Unionida (Униониды)	Hymenoptera (перепончатокрылые)
Family	Unionidae	Megachilidae
Genus	Alasmidonta	Osmia
Species	Alasmidonta varicosa	Osmia xanthomelana

Evolutionary Relationship

Brook Floater and Cliff Mason Bee share a common ancestor at the Kingdom level: Animalia. (животные)

Conservation Status

Brook Floater

VU — Vulnerable

Cliff Mason Bee

NE — Not Evaluated

Physical Characteristics

Attribute	Brook Floater	Cliff Mason Bee
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.

Cliff Mason Bee

Habitat

Typically found in virtually all terrestrial and freshwater habitats.

Range

Distributed across Denmark, Luxembourg, 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.

Cliff Mason Bee

The Cliff Mason Bee, Osmia species, is one of numerous solitary bees in the large genus Osmia, family Megachilidae, whose females construct individual brood cells from mud, clay, or resin in crevices on cliff faces, rock walls, and outcrops. Mason bees are important pollinators of wildflowers and orchard crops, collecting pollen and nectar to provision their nests. Cliff mason bees take advantage of natural crevices in rock faces as nesting sites, plastering cells of mud mixed with sand grains or plant material to subdivide the crevice into individual egg chambers. Each cell contains a pollen-nectar mass food provision and a single egg before being sealed with a mud plug. Males typically emerge first in spring, followed by females, and adults live for only several weeks, devoted entirely to mating and nesting. Cliff-nesting Osmia species are found in rocky habitats across the Holarctic region, from Europe through Asia and North America. The availability of suitable nesting sites on cliff faces, combined with the proximity of diverse wildflower resources, determines population density. Many solitary bee populations have declined in recent decades due to loss of nesting habitat and floral resources. Specific conservation status depends on the species intended.