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Zoogeography and Palaeontology:
The mouthparts of insects vary extremely in their structure The original mouth parts were apparently for biting and chewing and this type is very common In some groups, however, they turned into a suction apparatus
The parts of the biting mouth that are more primitive and simple are described here. While the suction mouth parts that have been transformed differently in different groups will be taken in connection with these groups.
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In front (in hypognathous heads) or above the mouth opening (in prognathous heads) is the anterior lip or labrum
It is a thin flap, suspended on the skull and moving forward and backward It attaches to the outside of each maxilla, not far from where the mandible joins the upper jaw head is a sort of small antenna-like structure consisting of one to six (usually five) segments, which is called the maxillary palpus Behind the maxilla and closing the mouth opening is the back lip or labia.
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Each segment bears a pair of legs, but the prothorax, or the first of three behind the head, has no wings
On the second, or mesothorax, and on the third, or metathorax, the wings and legs occur in most insects.
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These three pairs of legs can be very similar or very different, depending on the use put into running and walking insects are mostly the most similar But when, for example, the front legs are used to catch other insects, their shape will vary significantly that of the others.