long flat sensory structures associated with the mouth, found in worms and some arthropods.

Sensory organs associated with the mouthparts.

A sensory appendage found in many invertebrate species, that is located near the mouth, and used to assess or manipulate food before it is eaten.

Short, leg-like structures attached to the front of the cephalothorax between the fangs and the first pair of conventional legs. In females and in immature males they resemble small legs, although they have one less segment. In mature (or sometimes nearly mature) males the terminal segments are modified into a bulb and needle that are used for mating.