''Andrena'' is a genus of bees in the family

Andrenidae 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 gener ...

. With over 1,500 species, it is one of the largest genera of animals. It is a strongly monophyletic group that is difficult to split into more manageable divisions; currently, ''Andrena'' is organized into 104 subgenera. It is nearly worldwide in distribution, with the notable exceptions of

Oceania Oceania (, , ) is a geographical region that includes Australasia, Melanesia, Micronesia, and Polynesia. Spanning the Eastern and Western hemispheres, Oceania is estimated to have a land area of and a population of around 44.5 million ...

and

South America South America is a continent entirely in the Western Hemisphere and mostly in the Southern Hemisphere, with a relatively small portion in the Northern Hemisphere at the northern tip of the continent. It can also be described as the sout ...

. Bees in this genus are commonly known as mining bees due to their ground-nesting lifestyle.

Morphology

''Andrena'' are generally medium-sized bees; body length ranges between 8 and 17 mm with males being smaller and more slender than females. Most are black with white to tan hair, and their wings have either two or three submarginal cells. They carry pollen mainly on femoral scopal hairs, but many ''Andrena'' have an additional propodeal

corbicula ''Corbicula'' is a genus of freshwater and brackish water clams, aquatic bivalve mollusks in the family Cyrenidae, the basket clams.Gofas, S. (2015). Cyrenidae Gray, 1847. In: MolluscaBase (2015). Accessed through: World Register of Marine Spe ...

for carrying some pollen on their thorax. C. D. Michener (2007) ''The Bees of the World'', 2nd Edition, Johns Hopkins University Press. They can be distinguished from other bees by the broad velvety areas in between the

compound eye A compound eye is a visual organ found in arthropods such as insects and crustaceans. It may consist of thousands of ommatidia, which are tiny independent photoreception units that consist of a cornea, lens, and photoreceptor cells which disti ...

s and the antennal bases, called facial foveae. Some other genera in the family Andrenidae also have foveae though, so the best identifying feature unique to ''Andrena'' is the presence of a ring of hairs on the underside of their face called the "subgenal coronet".

Life history

All ''Andrena'' are ground nesting, solitary bees. They seem to have a preference for sandy soils. The genus includes no parasitic or social species, though some nest communally or in aggregations. After mating, each female bee digs a burrow, collects pollen to form firm, round provisions for the larvae to eat and places them in cells lined with a shiny secretion. Larvae do not spin a cocoon and they overwinter as adults. They typically have one generation per year and adults are only active for a few weeks. ''Andrena'' nests are attacked by many other insects including brood parasitic bees, blister beetles, various parasitic flies, and

Strepsiptera The Strepsiptera are an order of insects with eleven extant families that include about 600 described species. They are endoparasites in other insects, such as bees, wasps, leafhoppers, silverfish, and cockroaches. Females of most species never ...

. Many ''Andrena'' are host-plant specialists, in which a species visits flowers of only a single or a few closely related plants.

Oligolectic The term oligolecty is used in pollination ecology to refer to bees that exhibit a narrow, specialized preference for pollen sources, typically to a single family or genus of flowering plants. The preference may occasionally extend broadly to mult ...

''Andrena'' have specialized on many different plant groups and have morphological and behavioral adaptations that suit them for their pollen preference. For example, all members of the subgenus ''Callandrena'' specialize on pollen from the plant family Asteraceae and have highly branched, fluffy scopal hairs to hold aster pollen. According to Larkin ''et al.'' 2008,

oligolecty The term oligolecty is used in pollination ecology to refer to bees that exhibit a narrow, specialized preference for pollen sources, typically to a single family or genus of flowering plants. The preference may occasionally extend broadly to mult ...

was the basal trait for ''Andrena'' and a generalist diet has evolved multiple times across the genus.

Distribution

''Andrena'' are common in temperate regions of Europe, Asia, and North America and most diverse in areas with a Mediterranean climate. A small amount of species are present in sub-Saharan Africa, and there are none in South America, Australia and nearby islands, or Madagascar.

Species

Partial list of species: *'' Andrena angustitarsata'' * '' Andrena agilissima'' *'' Andrena accepta'' * †''

Andrena antoinei ''Andrena antoinei'' is an extinct species of mining bee in the family Andrenidae described from a single fossil found in a Late Oligocene lake in present-day France that existed in semi-arid conditions. History and classification ''A. antoin ...

'' Michez & De Meulemeester, 2014, late Oligocene of France *''

Andrena auricoma The golden-haired miner bee (''Andrena auricoma'') is a species of miner bee in the family Andrenidae The Andrenidae (commonly known as mining bees) are a large, nearly cosmopolitan family of solitary, ground-nesting bees. Most of the family' ...

'' *''

Andrena bicolor ''Andrena bicolor'', or Gwynne's mining bee, is a common and widespread Western Palearctic mining bee which is found over most of Europe as well as North Africa and the Middle East and which reaches eastwards into Siberia. Description ''Andren ...

'' Western Palearctic *'' Andrena cineraria'', Europe *''

Andrena fulva The tawny mining bee, ''Andrena fulva'', is a European species of the sand bee ('' Andrena'') genus. The males are and the females long. The female is covered with fox-red hair on the dorsal surface of its thorax and abdomen and black hair on ...

'', Europe *''

Andrena hattorfiana ''Andrena hattorfiana'' is a species of ''mining bees'' belonging to the family Andrenidae subfamily Andreninae. Description The adults grow up to long. They have a black-brown body with sparse light hair, while the first and the second ab ...

'', Europe *''

Andrena haemorrhoa ''Andrena haemorrhoa '' is a Palearctic species of mining bee.Edward Saunders Edward Saunders may refer to: *Edward W. Saunders (1860–1921), Virginian politician *Edward Saunders (judge) (died 1576), British judge *Edward Saunders (entomologi ...

'', Europe *''

Andrena lauracea ''Andrena lauracea'' is a rare bee species from the United States. It has been collected twice in Carlinville, Illinois, once around 1897 and once in 1970–1972. There are also two putative specimens from Texas Texas (, ; Spanish: '' ...

'', known only from 4 specimens in

Texas Texas (, ; Spanish: ''Texas'', ''Tejas'') is a state in the South Central region of the United States. At 268,596 square miles (695,662 km2), and with more than 29.1 million residents in 2020, it is the second-largest U.S. state by ...

and

Illinois Illinois ( ) is a state in the Midwestern United States. Its largest metropolitan areas include the Chicago metropolitan area, and the Metro East section, of Greater St. Louis. Other smaller metropolitan areas include, Peoria and Rockf ...

, in the central United States *'' Andrena lagopus'', Palearctic *'' Andrena salicifloris'', western North America *'' Andrena milwaukeensis'', United States and Southern Canada *'' Andrena hadfieldi,'' Southwestern United States See comprehensive separate list. Andrena accepta.jpg, ''A. accepta'' Andrena nasonii. saxifrage.jpg, ''A. nasonii'' Early mining bee (Andrena haemorrhoa) Cumnor.jpg, ''A. haemorrhoa'', Early mining bee, Oxfordshire Andrena Subgenus Gonandrena.jpg, ''Andrena'' Subgenus ''Gonandrena'', dogwood andrena Andrena nida, m, face, Montgomery Co 2015-12-01-11.55 (24641006220).jpg, ''A. nida'' Plos One 108865 Fig 6 A Andrena antoinei.png, ''A. antoinei'' fossil

References

External links

Bugguide.net
Andrena, North American species only).

diagnostic photographs and information
Andrena Identification Guide (female)Andrena Identification Guide (male)List of SpeciesWorldwide Species Map
{{Taxonbar, from=Q517165 Andreninae Bee genera Articles containing video clips