an external body part that projects from the body

either of a pair of mouthparts in insects and other arthropods that are usually used for biting and crushing food.

One of a set of three paired appendages on the thorax of a decapod crustacean, located just posterior to the maxillae and used in feeding.

One of the second pair of appendages near the mouth of a chelicerate, such as a spider or horseshoe crab, used for various reproductive, predatory, or sensory functions.

A maxillary palpus is a small several-segmented process on the outer aspect of each maxilla of an insect that is believed to have a sensory function.

is either one of the pair of jointed sensory appendages on the front of the mentum of an insect.