What are the functions and structure of mouthparts of insects? Information about mouthparts of insects.
Mouthparts Of Insects; The mouthparts of an insect are feeding structures derived from appendages of the fourth, fifth, and sixth segments of the head. The first set of mouthparts are the mandibles, which in biting and chewing insects are single biting or crushing toothlike structures. In insects that pierce tissues and suck sap, blood, or other fluids, the mandibles are blade-shaped organs.
The second set of mouthparts is a pair of maxillae, each of which consists of two lobes— the galea and lacinia—and a jointed, movable flaplike structure called a palp, which is often made up of five or six segments. The third feeding structure is the labium, a single structure that is like two maxillae joined together, with two pairs of lobes and one pair of palps.
The range of variation and structural modification of the mouthparts is almost endless. The cockroach, which is an omnivorous feeder, has the most generalized mouthparts. Among the insects with the most specialized mouthparts are the butterflies, which have a long coiled proboscis, a tube that is formed by the joining of modified galea lobes of the two maxillae.