1 / 13

Ch. 13 Entomology

Ch. 13 Entomology. Taxonomy Classification of Things in an Orderly Way. Forensic Entomology. Entomology is the study of insects. Forensic entomology involves the use of insects and other arthropods to aid in legal investigations. T here are three areas of application:

isabella-allison
Télécharger la présentation

Ch. 13 Entomology

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Ch. 13 Entomology

  2. Taxonomy Classification of Things in an Orderly Way

  3. Forensic Entomology Entomology is the study of insects. Forensic entomology involves the use of insects and other arthropods to aid in legal investigations. There are three areas of application: Insect damage to structures Infestation of foodstuffs Insects that inhabit human remains The latter category is the subject of this chapter.

  4. Hours since death = 98.4°F – internal body temperature 1.5 The Process of Death Algor Mortis: Body cooling rate Livor Mortis: skin discoloration caused by pooling of blood Rigor Mortis: rigidity of skeletal muscles A pathologist estimates time of death from these factors.

  5. A pathologist estimates time of death from these factors.

  6. Life Cycle of Insects Metamorphosis egg larva (maggot) pupa winged adult The life cycle of Musca domestica

  7. Time of Death Insects arrive at a decomposing body in a particular order (succession) and then complete their life cycle based on the surrounding temperature. By collecting and studying the types of insects found on a body and their metamorphic stage, a forensic entomologist can estimate the time of death.

  8. Flesh flies Blowflies Houseflies Insects of Death Diptera First to arrive Then Flies can arrive within minutes. They lay eggs that hatch to maggots. Maggots feed on soft, mushy body parts. More insects arrive to feed on the body and each other.

  9. Coleoptera In rough order of appearance, from within hours to dry decay: Rove beetle Sexton beetle Dermestid beetle Hide beetle Clown beetle Some beetles feed on the corpse, some on maggots, some on other beetles.

  10. Variables Affecting Metamorphosis Temperature The higher the temperature (within limits), the faster the growth.

  11. Habitat Fly species can vary geographically according to climate, season, and habitat. Phormia regina Lucilia illustris For example, the fly pictured on the left prefers shade; the one on the right, sunlit areas.

  12. Other Applications of Forensic Entomology Damage to structures, clothing, foodstuffs Location of wounds on a corpse Linking suspect to scene of crime Source of contraband Type of insects can trace vehicle movement Presence of drugs in corpse

  13. Collection of Evidence

More Related