DSC_1509 Giant flatworm ('Australopacifica' sp.) attacking a Denniston giant landsnail (Powelliphanta patrickensis) at night. To feed, the flatworm extrudes a sheet-like digestive tissue through a muscular tube or pharynx, located halfway down the underside of it's own body - this it places over the opening of the snail's shell. The flatworm's digestive tissue secretes a powerful enzyme which reduces the struggling snail to a ghastly stew inside it's shell, and the snail's nutrients are then absorbed by the flatworm. Once digestion is complete the digestive tissue is withdrawn back through the tube into the flatworm's body and the animal moves on, leaving behind a slimy, empty shell. Denniston Plateau.