part of develops from develops into posterior adult midgut progenitor developing embryonic structure late extended germ band embryo midgut primordium embryonic primordium of adult posterior midgut fly_anatomy.ontology FBbt:00005453 Pa AdMiPos An embryonic primordium that consists of the progenitors of the adult posterior midgut from the time of their segregation from the anterior midgut inclusive primordium during late embryonic stage 11 and early stage 12 until they intercalate into the posterior midgut epithelium during stage 15. adult posterior midgut primordium adult midgut precursor specific anlage FBbt:00017014 posterior endoderm derivative posterior midgut primordium