Aphids feed on plant fluids typically by virtue of piercing mouth parts (proboscis with stylets) that enter the plant and suck phloem fluids from the plant. The formation of the suctorial proboscis encompasses a fluid-tight food tube, special linking structures, modified sensory equipment, and novel intrinsic musculature. Fluid uptake is accomplished by the action of the cranial sucking pump, which enables uptake of a wide range of fluid quantities from different food sources.