Palpus refers to one of the appendages found on the head of certain arthropods, including insects, spiders, and crustaceans. This sensory organ is used for tactile and gustatory communication, and it is often referred to as a "feelers." Insects such as bees, flies, and mosquitoes have antennae, whereas spiders have pedipalps. Other synonyms for palpus include maxilla, chelicera, and mandible. These terms more specifically refer to different types of mouthparts found on arthropods, but they are sometimes used interchangeably. Regardless of the terminology used, palpus-like structures play a vital role in the survival and communication of many arthropods in the animal kingdom.