Lack of these structures is a characteristic ancestral trait of the Entognatha class.
Two types of these structures are hooked together in hamulate coupling. Lack of these structures is a characteristic ancestral trait of the Entognatha class. These structures may be derived from lateral lobe expansion according to the paranotal theory of their origin, although the pleural-origin hypothesis is supported by articulated exites. A morphogen named for the absence of these structures binds frizzled proteins and regulates these structures' development from namesake imaginal discs. Halteres are reduced, modified "hind" forms of these structures present in the order diptera. Scales create the bright colors and patterns of these structures in lepidoptera. For 10 points, name these paired thoracic structures used for insect flight.
Two types of these structures are hooked together in hamulate coupling.
wings &lt;Smart&gt;