part of part of develops from develops from ectoderm-derived structure insect clypeo-labral disc insect sclerite insect clypeus The anterior part of the head between the frons and the labrum, which occasionally may fuse with either one to form the frontoclypeus and the clypeolabrum. In the context of Drosophila refers to a round structure on the center of the frontal adult external head. FBbt:00004521 UBERON:6004521 insect basiproboscis