Zamonaviy tasnifga ko'ra, asalarilar bir guruhga (oila boshi) ular bilan qarindosh sfekoid asalarilar bilan birlashadi, ular ilgari Sphecoidea alohida oila boshi edilar. Miosen g'oyatining fosil vakillari ma'lum, masalan, 20 ga yaqin o'lik o'lgan asalari zotlari  †Electrolictus, Paleomelitta, Eomacropis, Electrobombus (Engel, 2001), fosil asalari †Apis miocenica Hong (1983). O'lib ketgan Sinostigma Hong (1983) turi Sinostigma spinalata (dastlab Melittidae sifatida, keyinchalik Megachilidae  Hong, 1985 ga o'tkazilgan, endi esa Pemphredon spinalatum asalari sifatida tushuniladi) turi bilan. 1975 yilda †Angarosphecidae Rasnitsyn, 1975 (= Baissodinae Rasnitsyn, 1975) o'tlar fosil oilasi ajratib olingan, keyinchalik Angarosphecinae kichik oilasi darajasigacha pasaytirilgan ( †Angarosphex Rasnitsyn, 1975 †Archisphex Evans, 1969 †Baissodes Rasnitsyn, 1975 va boshqalar). 2001 yilda †Paleomelittidae ariston ariston oilasi ajratib ko'rildi (Paleomelitta Engel, 2001). 2006 yilda Melittosphecidae yangi oilasining eng qadimgi †Melittosphex burmensis asalari tasvirlangan.
†Melittosphex burmensis? eng qadimgi asalari qachon tasvirlangan?
2006 yilda