part of overlaps develops from larval adipose system embryonic/larval fat body larval fat body Fully developed fat body of the late embryo (from stage 17 onward) or the larva. It is a bilateral, multilobed organ that extends the length of the insect (Butterworth et al., 1965). It is one cell thick and between one and ten cells wide (Butterworth et al., 1965). Large holes and clefts form during stage 17, giving the fat body its definitive larval form (Campos-Ortega and Hartenstein, 1997). FBbt:00001704 fly_anatomy.ontology larval fatbody FBbt:00005711 larva fat body fat body primordium somatic trunk mesoderm derivative