Andrena is a genus of bees in the family Andrenidae. With over 1,500 species, it is one of the largest genera of animals.[2] It is a strongly monophyletic group that is difficult to split into more manageable divisions;[3][4] currently, Andrena is organized into 104 subgenera.[2] It is nearly worldwide in distribution, with the notable exceptions of Oceania and South America. Bees in this genus are commonly known as mining bees due to their ground-nesting lifestyle.
^Dubitzky, Andreas; Plant, John; Schönitzer, Klaus (2010). "Phylogeny of the bee genus Andrena Fabricius based on morphology". Mitteilungen der Münchner Entomologischen Gesellschaft. 100: 137–202.