part of develops from imaginal ring foregut imaginal ring fly_anatomy.ontology Ring of imaginal tissue located in the embryonic/larval gut, at the junction of the foregut and midgut epithelia in the anterior part of the proventriculus. It is the precursor of the posterior region of the adult foregut. FBbt:00001836 proventriculus imaginal ring embryonic/larval foregut embryonic precursor of adult foregut anterior ectoderm derivative gut section