Insect morphology least three different positions: prognathous, opisthognathous, and hypognathous. In species with prognathous articulation, the head is positioned vertically aligned with the body, such as species of Formicidae; while in a hypognathous type, the head is aligned horizontally adjacent to the body. An opisthognathous head is positioned diagonally, such as species of Blattodea and some Coleoptera. The mouthparts vary greatly between insects of different orders, but the two main functional groups are mandibulate and haustellate. Haustellate mouthparts are used for sucking liquids and can be further classified by the presence of stylets, which include piercing-sucking, sponging, and siphoning. The stylets are
Insect development during storage development. However, quiescence acts like an anesthetic, and stops insect development for a short time by slowing down insect metabolic activity. It is induced by a sudden drop in temperature that ranges from 0 °C to 10 °C. A simulation of insects chilling in a morgue was conducted by using "Calliphora vicina" to illustrate that adult emergence is delayed by 24 hours, no matter in which stage the refrigeration occurred. There was no mortality when they were kept at 3 °C for 24 hours. In this simulation, quiescence was induced by the low temperature and the insect physiology was not