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Published byGwendolyn Carroll Modified over 8 years ago
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Forensic Entomology Notes on page 79
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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
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Life Cycle of the Fly Soon after death 1.8 days 2.5 days 4-5 days 8-12 days 21-24 days
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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
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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 2 nd instar stage; covered by fat deposits in 3 rd instar stage
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Maggots
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Pupa stages After 3 rd instar 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
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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
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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
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Question Answer this question on page 78 Explain how flies and maggots are used to help estimate the time since death of a decomposing body
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