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Forensic Entomology (Part II)

Forensic Entomology (Part II). Maggot Crop Analysis. Maggot as a Source of Human DNA. Maggots store food in their crops as they feed. During later stages of larval development, the contents of the crop is emptied into the gut. CROP. Mouth. Posterior. For example:.

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Forensic Entomology (Part II)

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  1. Forensic Entomology (Part II)

  2. Maggot Crop Analysis

  3. Maggot as a Source of Human DNA • Maggots store food in their crops as they feed. • During later stages of larval development, the contents of the crop is emptied into the gut CROP Mouth Posterior For example: In Calliphora vicina at room temperature, the crop is full after 3 days and is emptied by 7 days (approximate)

  4. Forensic DNA Analysis (review)

  5. Forensic DNA Review DNA is found in the cells in our body. Nucleus (Brain of the cell) Mitochondria (more later)

  6. Maggot Crop Analysis Identification of maggot crop contents would be helpful in three situations: Corpse is removed from suspected crime scene

  7. Maggot Crop Analysis > Corpse Removed A murder victim remains undiscovered. Flies discover the corpse and lay eggs.

  8. Maggot Crop Analysis > Corpse Removed A murder victim remains undiscovered. Flies discover the corpse and lay eggs.

  9. Maggot Crop Analysis > Corpse Removed Maggots hatch and feed on the corpse.

  10. Maggot Crop Analysis > Corpse Removed Murder victim is removed from crime scene. The maggots remain.

  11. Maggot Crop Analysis > Corpse Removed Crop will contain Human tissue

  12. Maggot Crop Analysis Identification of maggot crop contents would be helpful in three situations: There is a question as to the origin of a maggot used in a PMI estimation

  13. Maggot Crop Analysis > Maggots from Other Source A turkey is thrown into a dumpster.

  14. Maggot Crop Analysis > Maggots from Other Source A turkey is thrown into a dumpster.

  15. Maggot Crop Analysis > Maggots from Other Source Three days later, maggots have developed on the turkey.

  16. Maggot Crop Analysis > Maggots from Other Source Also three days later, a dead body is thrown into the dumpster.

  17. Maggot Crop Analysis > Maggots from Other Source The maggots migrate from the turkey to the human body.

  18. Maggot Crop Analysis > Maggots from Other Source The maggots migrate from the turkey to the human body.

  19. Maggot Crop Analysis > Maggots from Other Source Crop will contain Turkey tissue or a mixture of Turkey/Human tissue

  20. Maggot Crop Analysis Identification of maggot crop contents would be helpful in three situations: There may be a chain of evidence dispute.

  21. Maggot Crop Analysis > Chain of Evidence Dispute Here you go! Thank you!

  22. Maggot Crop Analysis > Chain of Evidence Dispute 2 days later... They’re 5 days old! These aren’t the maggots I gave you. Are too! Are not!

  23. Maggot Crop Analysis Poor quality of samples usually prevents analysis.

  24. Maggot Crop Analysis

  25. Maggot Dissection Maggot before dissection

  26. Maggot Dissection Cut off posterior segments

  27. Maggot Dissection Ventral incision of the cuticle

  28. Maggot Dissection Peel back cuticle to reveal crop

  29. Maggot Dissection Remove crop

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