Minute Bees
Until recently those who worked on the taxonomy of bees, or taxonomy in general for that matter, were men. Culturally that imbalance is now shifting, though we clearly still have a ways to go. Early female taxonomists were not unheard of however, and Australian Elizabeth Exley was a good example having described over 200 species of bees, working even after her retirement just for the joy of it. She described many of the 41 species of Minute Bees.
Minutes Bees are just that, minute, some are as small as 2mm in length and all have a wan yellow base color to the integument of their exoskeleton . They are known to feed on the many species of plants in the Myrtle family in Australia, especially from Eucalyptus where hundreds of individuals can be obtained with a sweep net and an extremely long handle. These bees are a good example of the evolutionary radiation that occurred in the family Colletidae in Australia with bees ranging much larger than a honeybee down to less than 2 mm. Original public domain image from Flickr