part of develops from embryonic/larval middle midgut embryonic/larval copper cell larval cuprophilic cell Specialized cell of the larval midgut. It secretes acid and accumulates copper. It shows a distinct apical invagination, with an opening to the lumen. The invagination is flask shaped in the posteriormost copper cells with a narrow opening, while anteriormost copper cells are beaker shaped and their opening to the lumen is larger. FBbt:00001887 fly_anatomy.ontology calycocyte larval secretory cell of the middle midgut FBbt:00005625 embryonic/larval cuprophilic cell copper cell primordium copper cell posterior endoderm derivative larval midgut enterocyte