Abstract
Forensic entomology is the use of arthropod evidence in legal investigations is becoming increasingly more important in such investigations. Most often, forensic entomologists assist homicide investigations by estimating the time of death using information on the biology and ecology of arthropods. In murder investigations it deals with which insect’s eggs appear, their location on the body and in what order they appear. In medico-legal death investigations one of the most critical question is, ‘‘When did the death take place?’’ An accurate estimation of the post mortem interval has special relevance in a homicide case because this information can narrow the field of possible suspects in a crime. Forensic entomology helpful in determining a post mortem interval (PMI) and location of a death in question. Since many insects exhibit a degree of endemism (occurring only in certain places), or have a well-defined phenology (active only at a certain season, or time of day), their presence in association with other evidence can demonstrate potential links to times and locations where other events may have occurred. Another area covered by medico legal forensic entomology is the relatively new field of entomotoxicology. This particular branch involves the utilization of entomological specimens found at a scene in order to test for different drugs that may have possibly played a role in the death of the victim. Forensic entomology is recognized in many countries as an important tool for legal investigations. Unfortunately, it has not received much attention in Bangladesh as an important investigative tool. This paper reviews the various types of insect’s behavior on corpse also important information we will find from them. This is helpful for the investigators, law personnel and researchers aware of the importance of entomology in criminal investigations. Correct estimation of the post mortem interval is one of the most important aspects of legal medicine.
Highlights
Forensic entomology is an integral part of a death investigation when estimating the time since death beyond 72 h
According to Smith (1986) four categories of insects can be found on decomposing carrion: i) Necrophagous species feeding on the carrion; ii) Predators and parasites feeding on the necrophagous species: this group contains schizophagous species which feed on the body first and which become predaceous on the later stages; iii) Omnivorous species feeding on the carrion and other arthropods like ants, wasps and some beetles; iv) Other species like springtails and spiders which use the corpse as an extension of their environment
Post-decay stage (Days 10-23) The post-decay stage begins when most of the Diptera larvae leave the carcass, leaving behind bones, cartilage, hair, small portions of tissue, and a large amount of wet, viscous material known as byproducts of decay (BOD)
Summary
Forensic entomology is an integral part of a death investigation when estimating the time since death beyond 72 h. The volatile molecules called apeneumones escaping from the decomposing body attract insects. According to Smith (1986) four categories of insects can be found on decomposing carrion: i) Necrophagous species feeding on the carrion; ii) Predators and parasites feeding on the necrophagous species: this group contains schizophagous species which feed on the body first and which become predaceous on the later stages; iii) Omnivorous species feeding on the carrion and other arthropods like ants, wasps and some beetles; iv) Other species like springtails and spiders which use the corpse as an extension of their environment. The first two groups are found to be more important for the purpose of forensic entomology They are mainly from the species of the order Diptera (flies) and Coleoptera (beetles). Muscidae (house flies) delay colonization until the body reaches bloat stages of decomposition
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