These small short-tongued bees nest in the soil and are usually solitary, although a few species are communal. There are two subfamilies that will be described. Andreninae (Andrenine Bees, Small Miner Bees): These small bees are most common during the spring. They are especially likely to visit shrubs or small trees of the Rose family that bloom during the spring, while a few species are specialists of certain spring-blooming wildflowers, such as violets and trout lilies. They line their nests with water-resistant chemicals. There are many Andrenid species; the specialists among them are usually uncommon. Panurginae (Dagger Bees, Panurgine Bees): These relatively hairless bees that construct unlined nests in the ground. This subfamily consists primarily of Calliopsis, Heterosarus, and Perdita spp. They are more likely to visit wildflowers later in the year than the Andrena spp.
Molecular Biology and Genetics
Statistics of barcoding coverage
Specimens with Sequences:4409
Specimens with Barcodes:3382
Species With Barcodes:822
The Andrenidae (commonly known as mining bees) are a large, nearly cosmopolitan family of solitary, ground-nesting bees. Most of the family's diversity is located in temperate or arid areas (warm temperate xeric). It includes some enormous genera (e.g., Andrena with over 1300 species, and Perdita with nearly 800). One of the subfamilies, Oxaeinae, is so different in appearance that they were typically accorded family status, but careful phylogenetic analysis reveals them to be an offshoot within the Andrenidae, very close to the Andreninae.
They are typically small to moderate-sized bees, which often have scopae on the basal segments of the leg in addition to the tibia, and are commonly oligolectic (especially within the subfamily Panurginae). They can be separated from other bee families by the presence of two subantennal sutures on the face, a primitive trait shared with the sphecoid wasps. Many groups also have depressions or grooves called "foveae" on the head near the upper margin of the eyes, another feature seen in sphecoids, and also shared by some Colletidae. Andrenids are among the few bee families that have no cleptoparasitic species. There are also a very large number of taxa, especially among the Panurginae, whose sting apparatus is so reduced that they are effectively unable to sting.
Andrenidae are one of the four bee families that contain some crepuscular species; these species are active only at dusk or in the early evening, and therefore technically considered "vespertine". In the Andrenidae, such species occur primarily in the subfamily Panurginae. These bees, as is typical in such cases, have greatly enlarged ocelli, though one crepuscular subgenus of Andrena has normal ocelli. The other families with some crepuscular species are Halictidae, Colletidae, and Apidae.
- C. D. Michener (2007) The Bees of the World, 2nd Edition, Johns Hopkins University Press.
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