Res Natural - Forensic Entomology

The idea behind using insects to estimate a minimum PMI, or post-mortem interval, is based on how insects develop or grow up. Some insects, those with a so called complete metamorphosis, have immature stages whose movement is extremely limited, but have adults that are among the most mobile animals on earth. Some of these insects are specialized to develop on dead animals or carrion, including corpses. The adults fly far and wide searching for a suitable corpse. When they find one they lay their eggs. The eggs develop into larvae, white flabby eating machines that grow by eating the corpse. The larvae cannot move far, and eventually change into winged adults via an intermediate stage called the pupa. Therefore, if one collects an egg, larva, or pupa of one of these carrion insects on a corpse,, this eggs, larvae or pupa had to develop at that corpse and did not come in already formed from somewhere else. If an entomologist k

Also, The third time a maggot "sheds its skin" a remarkable thing happens. The skin contracts to a capsule-like form and becomes rigid and hardened. It is not actually shed, but remains covering the newly-molted insect inside. You can see that the puparial skin is the same as old maggot skin because it retains the outlines of the spiracles and other sclerotized parts of that stage. For example, the scanning electron micrograph above is an end-on view of the posterior of a blow fly puparium. The three slits on each side are the "mummified" traces of the three slits visible in the posterior spiracles of the maggot (to see the resemblence compare this photo with the photo on the right preceding it).

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