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Modification of postmortem wounds by Dermestes maculatus (Coleoptera: Dermestidae) activity: A preliminary study
Noelia I Zanetti1, Adriana A Ferrero2, Néstor D Centeno3
1Laboratorio de Entomología Aplicada y Forense, Departamento de Ciencia y Técnica, Universidad Nacional de Quilmes, Roque Sáenz Peña 352, Bernal 1876, Provincia de Buenos Aires, Argentina; Cátedra de Invertebrados II, Departamento de Biología, Bioquímica y Farmacia, Universidad Nacional del Sur, San Juan 670, Bahía Blanca 8000, Provincia de Buenos Aires, Argentina.
Abstract:
The purpose of this analysis was to evaluate the effects of insect activity on hacking trauma which was inflicted with a small cleaver and a razor blade under controlled conditions. Three pig hooves were each subjected to a blow with a small cleaver and a cut with a razor blade prior to insect exposure. We used Dermestes maculatus DeGeer 1774 species. These beetles made principally depressions and destruction on both wounds, and bites were observed on the edges of the wounds. As time passed and insects fed and refuge, chop marks were deformed and disappeared, taking this less than a month. Thus, D. maculatus could mask postmortem wounds and probably premortem wounds, and so the cause of death.
Insights
Insect activity, specifically Dermestes maculatus beetles, can significantly alter hacking trauma wounds. These insects deform and erase chop marks within a month, potentially masking the original cause of death.
Area of Science:
- Forensic Entomology
- Forensic Pathology
Background:
- Insect activity can affect the interpretation of traumatic injuries in forensic investigations.
- Understanding insect-bone interactions is crucial for accurate postmortem interval estimation and wound analysis.
Purpose of the Study:
- To evaluate the impact of Dermestes maculatus beetle activity on hacking trauma inflicted on pig hooves.
- To determine how insect feeding and refuge behaviors alter the appearance of cleaver and razor blade wounds.
Main Methods:
- Controlled experiment using three pig hooves subjected to cleaver blows and razor cuts.
- Exposure of wounds to Dermestes maculatus beetles under specific conditions.
- Observation and documentation of changes to wound morphology over time.
Main Results:
- Dermestes maculatus beetles caused depressions and destruction on the wounds.
- Bites were observed along the wound edges.
- Deformation and disappearance of chop marks occurred in less than a month due to insect feeding and refuge.
Conclusions:
- Dermestes maculatus can significantly alter the appearance of postmortem hacking trauma.
- Insect activity may mask or obscure evidence of the original wounds, potentially complicating the determination of the cause of death.
- Forensic entomologists must consider insect activity when analyzing wounds to avoid misinterpretation.
