part of develops from develops into embryonic imaginal tissue imaginal disc primordium fly_anatomy.ontology imaginal disc specific anlage Population of contiguous, morphologically distinct cells of the embryo that will proliferate to form an imaginal disc in the larva. During early embryogenesis the precursor is part of the epithelial sheet before segregating from the epithelial sheet by late embryogenesis (Cohen, 1993). FBbt:00001649 UBERON:6001649 imaginal disc dorsal closure embryo primordium ventral epidermis primordium ventral ectoderm derivative