Fig. 6

Interpretive drawings explaining the new model for opening and closing mechanisms of the sharpshooter precibarial valve and fluid flow through it. Cartoons show cuticular structures only. (a) Saggital section of the valve when closed and the valve muscle is relaxed showing movements performed to close the valve; based on a tracing of Fig. 2a. (b) Saggital section of the hypothesized appearance of the opened valve showing movement performed to open the valve. Numbers and arrows represent order of movements described in text. (c) Diagram of fluid flow through the precibarium when the valve is being opened or closed. (d) Diagram of fluid flow through the precibarium when the valve is open. For c and d: short-dash line, outward fluid movement for swallowing; long-dash line, fluid moving in/being taken up for later ingestion; solid line, fluid moving out/egestion (for c, rinsing egestion; for d, discharging egestion). For color version: colors are based on those in Fig. 2, that is, red, resilin; yellow, sclerotin; pink; procuticle. For black-and-white version: dark gray, resilin; pale gray, sclerotin; medium gray, procuticle.