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What information can a forensic entomologist provide at the death scene?

Posted in Forensic Entomology & DNA Barcoding by paibiopai on November 23, 2009

Forensic entomologists are commonly called upon to determine the postmortem interval or “time since death” in homicide investigations.  More specifically, the forensic entomologist estimates a portion of the postmortem interval based on the age of the insect present.  This entomological based estimation is most commonly called the “Time Since Colonization”.  Based on the factors in a particular investigation, this may, or may not, closely approximate the entire postmortem interval.  In either case, it is the duty of the Forensic Pathologist, Medical Examiner, or Coroner to estimate the postmortem interval, and the Forensic Entomologist may assist them in providing information on the “time since colonization”, which can ultimately be used to substantiate a portion of the postmortem interval.

The forensic entomologist can use a number of different techniques including species succession, larval weight, larval length, and a more technical method known as the accumulated degree hour technique which can be very precise if the necessary data is available.  A qualified forensic entomologist can also make inferences as to possible postmortem movement of a corpse.  Some flies prefer specific habitats such as a distinct preference for laying their eggs in an outdoor or indoor environment.   Flies can also exhibit preferences for carcasses in shade or sunlit conditions of the (more…)

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Common Insects found as Entomological Evidence -forensic entomology-

Posted in Forensic Entomology & DNA Barcoding by paibiopai on November 23, 2009

Acari

The Acari, or mites as they also are called, are small organisms, usually less than a mm in length. Mites occur under the dead body in the soil, during the later stages of decay. Many mites are transported to the body via other insects, such as flies or beetles. Other mites are soil dwelling forms which can be predators, fungus feeders or detritus feeders. Most species will be found in soil samples from seepage area under the body.

Aranea

The Aranea or spiders are predators on insects occurring on bodies. No species is specific to the carrion fauna, and will have limited or no value in estimation of the PMI.

Diptera

The order diptera contains insects with one pair of wings, the second ones modified to halteres. About 100,000 species are known to science, many more awaits discovery. Among the flies we find many members of the carrion fauna. The larvae of flies lives in very different habitats, also aquatic.

 

 

 

 

 

NEMATOCERA

Trichoceridae

Trichocera sp.

or winter-gnats as they also are called because the common species Trichocera regelationis, T. saltator, T. maculipennis, etc, fly abundantly in the winter months, although they occur at lower frequencies throughout the year. The adults resemble small crane-flies. The larvae are saprophagous and feed on decaying material. Trichocerid larvae constitutes an important part of the carrion fauna during the winter months, when the blowfly fauna are missing.

BRACHYCERA

Stratiomyidae

Larvae of Hermetia illucens is recorded eating on human excrement and human remains. Usually this species occur late in the decomposing process

(more…)

General SOP for Forensic Entomology -Working in Death Scenes-

Posted in Forensic Entomology & DNA Barcoding by paibiopai on October 9, 2009
This is how we work on death scenes collecting forensic entomology evidence..
just click here to see the rest.. (more…)

forensic entomology

Posted in Forensic Entomology & DNA Barcoding by paibiopai on October 7, 2009

to be more specifically, my thesis topic is about forensic entomology in molecular view especially in molecular mtDNA barcoding

just FYI,,

what is forensic entomology???

Forensic Entomology is the use of the insects, and their arthropod relatives that inhabit decomposing remains to aid legal investigations.  The broad field of forensic entomology is commonly broken down into three general areas: medicolegal, urban, and stored product pests.  The medicolegal section focuses on the criminal component of the legal system and deals with the necrophagous (or carrion) feeding insects that typically infest human remains. The urban aspect deals with the (more…)

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