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Forensic Entomology

Forensic Entomology. Notes on page 75. What is Forensic Entomology?. Applying the study of insect life cycle to estimating time of death Flies and beetles follow a life cycle that allow scientists to estimate how long a body has been deceased. 21-24 days. 8-12 days. Soon after death.

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Forensic Entomology

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  1. Forensic Entomology Notes on page 75

  2. What is Forensic Entomology? • Applying the study of insect life cycle to estimating time of death • Flies and beetles follow a life cycle that allow scientists to estimate how long a body has been deceased

  3. 21-24 days 8-12 days Soon after death 4-5 days 1.8 days 2.5 days Life Cycle of the Fly

  4. You do NOT need to know time frames and lengths!!! The egg • Shortly after death, a mature fly will lay eggs on the decomposing flesh • Will typically lay eggs in moist, warm areas • Mouth, eyes, ears, anus, wounds • Will remain 8 hours • Approximately 2 mm in length

  5. You do NOT need to know time frames and lengths!!! Larval stages • Also called instar 1, 2 and 3 • Have black mouth hooks • Will have spiracle slits near anus • Instar 1: 1 spiracle slit; 5 mm in length • Instar 2: 2 spiracle slits; 10 mm in length • Instar 3: 3 spiracle slits; 17 mm in length • Crop visible in 2nd instar stage; covered by fat deposits in 3rd instar stage

  6. Maggots

  7. You do NOT need to know time frames and lengths!!! Pupa stages After 3rdinstar maggots have matured, they will crawl away from body to a dry area Become immobile, do not eat, changes to a dark brown color, pupa case is hard Can stay in pupa cases for 10-16 days

  8. Adult flies Adult fly matures in approximately 21-24 days They will be alive for several weeks Not able to fly in first couple of hours

  9. Beetles Beetle larva differ from maggots in that they have 3 pairs of legs Arrive on body after flies lay eggs Come to feed on the maggots

  10. Question Answer this question on page 74 Explain how flies and maggots are used to help estimate the time since death of a decomposing body

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