Wasps in this group were previously collected in the now obsolete superfamily Sphecoidea (synonymous with the series Spheciformes), which grouping is, however, paraphyletic. Bees are now thought to have descended from wasps from the family Crabronidae.
- (superfamily): Insecta - class; Dicondylia - clade; Pterygota - subclass; Metapterygota - clade; Neoptera - infraclass; Eumetabola, Endopterygota - clades; Hymenopterida - superorder; Hymenoptera - order; Apocrita - suborder
- (superfamily): Ampulicidae (cockroach wasps), Andrenidae, Apidae (many bees, including honey bees), Colletidae (masked bees, miner bees and plasterer bees), Crabronidae (some wasps), Halictidae (sweat bees), Heterogynaidae (certain wasps), Megachilidae, Melittidae, Sphecidae (thread-waisted wasps), Stenotritidae (families)
- Angarosphecidae, Paleomelittidae (extinct families)