Credit: MATTHEW STANSBURY, BASED ON R.F. CHAPMAN AFTER D.S. SMITH 1963
A cross-section diagram of the adult firefly lantern shows photic (yellow) and dorsal (blue) layers, tracheae and tracheal end-cell complexes (purple), nerve axons (green), epidermis (red), the transparent cuticle (brown), and the clustered cells of the photic layer (orange circle).