Diadasia

Diadasia is a genus of bees belonging to the family Apidae and the subfamily Apinae. These bees are commonly known as cactus bees or globe-mallow bees due to their oligolectic association with plants in the families Cactaceae and Malvaceae, respectively. Diadasia bees are primarily found in North and South America.

Characteristics:

Diadasia bees exhibit several defining characteristics. They are generally medium-sized bees. A significant feature is the presence of scopa (pollen-collecting hairs) on the hind legs of females. This scopa is particularly well-developed in species that specialize in collecting pollen from specific plant families. The color of Diadasia bees varies depending on the species, ranging from dark brown to black, often with pale bands of hair on the abdomen. They possess robust bodies and are typically active during the warmer months of the year.

Ecology and Behavior:

Diadasia species are known for their oligolectic behavior, meaning they collect pollen almost exclusively from a narrow range of plant species. This specialization makes them important pollinators for their host plants. Some species of Diadasia nest gregariously in large aggregations, forming dense colonies in the ground. The males often emerge before the females and patrol the nesting areas, searching for mates. The females construct individual cells within the nests, provision them with pollen and nectar, and lay their eggs.

Taxonomy:

The genus Diadasia is divided into several species, each with its own specific characteristics and geographical distribution. Ongoing research continues to refine the taxonomy and phylogenetic relationships within the genus.

Conservation:

The conservation status of Diadasia bees varies depending on the species and their specific habitat. Habitat loss, pesticide use, and climate change are potential threats to these bees, particularly those that are highly specialized to specific plant species. Protecting the habitats of their host plants is crucial for the conservation of Diadasia bees.