<i>Octopus vulgaris</i> sucker during adhesion process. TramacereFrancesca BeccaiLucia KubaMichael GozziAlessandro BifoneAngelo MazzolaiBarbara 2013 <p>A) Ultrasonography of middle transverse section of sucker attached to the ultrasonographic probe. B) Schematic of A: a, acetabulum; in, infundibulum; w, water; p, ultrasonographic probe. The acetabular protuberance is in contact with the upper part of the side walls of the orifice. The scale bar equals 1 cm.</p>