Pollen wasps, the Masarinae, are unusual wasps that are typically treated as a subfamily of Vespidae, but have in the past sometimes been recognized as a separate family, "Masaridae", which also included the subfamilies Euparagiinae and Gayellinae.
Pollen wasps, specifically the Masarinae, are unusual wasps that are usually classified as part of the Vespidae subfamily but have been recognized as a separate family, "Masaridae," which also included other related subfamilies such as Euparagiinae and Gayellinae.