Adhesive organs of M. lignano shown with scanning electron microscopy (A-G) and phalloidin staining of actin filaments (H-N). Scanning electron microscopy overview (A), tail-plate (B) and detail thereof (C), and details of adhesive organs (D-G). Note microvilli collar on the anchor cells (D, F, G) and adhesive vesicle on the tip of an adhesive organ (E). Phalloidin staining overview (H), tail plate (I) and details thereof (J), and details of the adhesive papillae (K, L). ao adhesive organ; fgo female genital opening; mgo male genital opening; mo mouth opening; tp tail-plate; rh rhabdites. Scale bars (A, H) 100 μm, (B) 20 μm, (C, I, J) 10 μm, (D) 2 μm, (E-G) 0.5 μm, (K, L) 1 μm.