Brook Floater vs Cliff Mining Bee

Alasmidonta varicosa compared with Andrena thoracica

Key Differences

• Brook Floater is Vulnerable while Cliff Mining Bee is Extinct.

Taxonomic Classification

Rank	Brook Floater	Cliff Mining Bee
Kingdom same	Animalia (สัตว์)	Animalia (สัตว์)
Phylum	Mollusca (มอลลัสกา)	Arthropoda (สัตว์ขาปล้อง)
Class	Bivalvia (ชั้นไบวาลเวีย)	Insecta (แมลง)
Order	Unionida (Unionida)	Hymenoptera (แตน)
Family	Unionidae	Andrenidae
Genus	Alasmidonta	Andrena
Species	Alasmidonta varicosa	Andrena thoracica

Evolutionary Relationship

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

Conservation Status

Brook Floater

VU — Vulnerable

Cliff Mining Bee

EX — Extinct

Physical Characteristics

Attribute	Brook Floater	Cliff Mining 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 Mining Bee

Habitat

Typically found in virtually all terrestrial and freshwater habitats.

Range

Distributed across Denmark, Luxembourg, 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.

Cliff Mining Bee

The Cliff Mining Bee, Andrena species in the family Andrenidae, is a solitary ground-nesting bee that excavates tunnels in cliff faces, earthen banks, and compacted sandy or loamy soils, where the loose or friable substrates exposed in cliff profiles provide ideal nesting conditions. Mining bees in the genus Andrena are among the most species-rich solitary bee genera in the world, with hundreds of species across the Holarctic region, many narrowly specialized in their choice of pollen host plants. Female cliff mining bees construct vertical or angled burrows in cliff faces, with lateral cells off the main shaft, each containing a pollen ball and a single egg. Males are typically smaller and emerge before females to establish territories near nesting sites. Many Andrena species are oligolectic, collecting pollen from only a small number of plant species, making their populations sensitive to the availability of specific flowering plants in the landscape surrounding nesting areas. Cliff and bank nesting habitats provide well-drained, sun-warmed substrates essential for brood development. The loss of natural cliff faces and earthen banks to development, vegetation succession, and quarrying reduces available nesting habitat for cliff mining bees.