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MSU ISB 202 - Lecture 16: Forensic Entomology
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PowerPoint PresentationSlide 2Slide 3Slide 4Slide 5Slide 6Slide 7Slide 8Slide 9Slide 10Slide 11Slide 12Slide 13Slide 14Slide 15Slide 16Slide 17Slide 18Slide 19Slide 20Slide 21Slide 22Forensic EntomologyForensic EntomologyLecture 16Lecture 16Guest Lecturer:Dr. Richard MerrittDept. of EntomologyMichigan State UniversityGuest Lecturer:Dr. Richard MerrittDept. of EntomologyMichigan State UniversityWebsites:http://www.forensic-entomology.com/ http://www.uio.no/~mostarke/forens_ent/forensic_entomology.html http://www.key-net.net/users/swb/forensics/index.htmWebsites:http://www.forensic-entomology.com/ http://www.uio.no/~mostarke/forens_ent/forensic_entomology.html http://www.key-net.net/users/swb/forensics/index.htmGoals:Goals:1. Understand postmortem interval, insect development, role of insects in decomposition & ecological succession. 2. Learn about the stages of animal decomposition & theinsects associated with each stage.3. Learn about the barriers to decomposition.1. Understand postmortem interval, insect development, role of insects in decomposition & ecological succession. 2. Learn about the stages of animal decomposition & theinsects associated with each stage.3. Learn about the barriers to decomposition.I. Introduction and Definition of Forensic EntomologyI. Introduction and Definition of Forensic EntomologyForensic entomology is the application of the study of insects and other arthropods to legal issues, especially in a court of law.Forensic entomology is the application of the study of insects and other arthropods to legal issues, especially in a court of law.The most common application of the medicocriminal category related to death investigations. Key elements in these investigations, such as time since death (that is the time between death and corpse discovery, which is generally referred to as the postmortem interval or PMI), movement of the corpse, manner and cause of death, associated of suspects with the death scene, as well as detection of toxins or drugs through analysis of insect larvae, may all relate to arthropod occurrence and activities.The most common application of the medicocriminal category related to death investigations. Key elements in these investigations, such as time since death (that is the time between death and corpse discovery, which is generally referred to as the postmortem interval or PMI), movement of the corpse, manner and cause of death, associated of suspects with the death scene, as well as detection of toxins or drugs through analysis of insect larvae, may all relate to arthropod occurrence and activities.Although forensic entomology includes several categories, the type that we will be talking about is medicolegal forensic entomology. It deals with arthropod involvement in events surrounding felonies, usually violent crimes such as murder, suicide, and rape but also includes other violations such as physical abuse and contraband trafficking. A more accurate name for this category is medicocriminal forensic entomology.Although forensic entomology includes several categories, the type that we will be talking about is medicolegal forensic entomology. It deals with arthropod involvement in events surrounding felonies, usually violent crimes such as murder, suicide, and rape but also includes other violations such as physical abuse and contraband trafficking. A more accurate name for this category is medicocriminal forensic entomology.II. History of Forensic EntomologyII. History of Forensic EntomologyIII. Basis for Use of Insects in Determining Postmortem IntervalsIII. Basis for Use of Insects in Determining Postmortem IntervalsIV. Types of Insect Development IV. Types of Insect Development A. Ametabolous metamorphosis - without change- spring tailsA. Ametabolous metamorphosis - without change- spring tailsB. Gradual metamorphosis - gradual change from immature to adult. Cockroaches, predatory bugsB. Gradual metamorphosis - gradual change from immature to adult. Cockroaches, predatory bugsC. Complete metamorphosis - egg-larvae-pupa-adult-larvae different from adult, example maggot and fly. Probably the most common stage encountered in crime investigations -- important to collect both adults and immatures.C. Complete metamorphosis - egg-larvae-pupa-adult-larvae different from adult, example maggot and fly. Probably the most common stage encountered in crime investigations -- important to collect both adults and immatures.V. Ecological Role of Insects in DecompositionV. Ecological Role of Insects in Decomposition1. Necrophages - the species feeding on corpse tissue. Include most rue flies (Diptera) and beetles (Coleoptera). Age determination of these insects usually basis for making PMI estimations.1. Necrophages - the species feeding on corpse tissue. Include most rue flies (Diptera) and beetles (Coleoptera). Age determination of these insects usually basis for making PMI estimations.2. Omnivores - species such as ants, wasps, and some beetles that feed on both the corpse and associated fauna. Large populations of these may retard the rate of corpse decomposition by depleting populations of necrophagous species.2. Omnivores - species such as ants, wasps, and some beetles that feed on both the corpse and associated fauna. Large populations of these may retard the rate of corpse decomposition by depleting populations of necrophagous species.V. Ecological Role of Insects in DecompositionV. Ecological Role of Insects in Decomposition3. Parasites and Predators - many beetles, true flies and wasps that parasiize immature flies.3. Parasites and Predators - many beetles, true flies and wasps that parasiize immature flies.4. Incidentals - arthropods that use the corpse as a concentrated resource extension of their normal habitat, eg. Eprintails, spiders, centipides, pill bugs, and some mites.4. Incidentals - arthropods that use the corpse as a concentrated resource extension of their normal habitat, eg. Eprintails, spiders, centipides, pill bugs, and some mites.VI. Concept of Ecological Succession as Applied to Insects Being Used to Determine PMIVI. Concept of Ecological Succession as Applied to Insects Being Used to Determine PMIEstimates of postmortem intervals based on insects present on the remains may be based on.Estimates of postmortem intervals based on insects present on the remains may be based on.A. The period of time required for a given species to reach a


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MSU ISB 202 - Lecture 16: Forensic Entomology

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