Actual Knowledge of Necrophagous Entomofauna on Buried Remians

The diversity of arthropods collected can be important, gathering necrophagous, predators, parasites, omnivorous and opportunists (Dadour and Harvey 2008). Arthropods found in the surroundings of buried bodies are described in two different classes: Arachnida (Acari, Spiders, Millipedes) and Insecta (Collembola, Thysanura, Blattodea, Hymenoptera or Ants, Dermaptera, Diptera and Coleoptera). Within this population, few taxa (mainly Diptera and some Coleoptera) have a forensic interest in estimating the PMI. One cannot exclude the impact of groups such as predators (Spiders, Coleoptera but also pseudoscorpions or Dermaptera) that play a role in determining the size of others groups. Among opportunists are Blattodea (more active at night) and Thysanura, which feed on stored product or detritus. Both are observed on carrion during the later steps of decay. Hymenopterans gather taxa with a wide diversity of diet: necrophagous (bee and wasps), predators of larvae and pupae of Diptera and Coloeoptera (Vespidae) but also parasites of Diptera during larval and pupal stage (Chalcididae, Braconidae, etc.).

Acari or Mites are small specimens almost never used in estimating PMI. Some of them feed on eggs or larvae of others insects; others that feed directly on fluids of decaying tissues (so as Lepidoptera) are detritivorous or fungivorous. Megnin (1894) associated them within the sixth wave, during the later stages of decay. Goff (1989) described four gamasid families known to use carrion insects as carriers: Diptera (Muscidae: Musca domestica) and Coleoptera (Silphidae or Carabidae). His studies showed changes over time in the acari population which could be linked with PMI indication. They can thus be interesting forensic indicators.

Lepidoptera were also listed in the chronological succession pattern proposed by Megnin; Pyralidae and Tineidae were respectively observed during fats rancid and dry remains stages. Several other species have been observed on buried animal carcasses (Payne et al. 1968; Vanlaerhoven and Anderson 1999).

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