Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The family Andrenidae is a large (nearly) cosmopolitan (absent in Australia) non-parasitic bee family, with most of the diversity in temperate and/or arid areas (warm temperate xeric), including some truly enormous genera (e.g., Andrena with over 1300 species, and Perdita with nearly 800). One of the subfamilies, Oxaeinae, are 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.

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