Abstract
Necrophagous insects, mainly Diptera and Coleoptera, are involved in the cadaveric decomposition process depending on time ofstudy and location, are important to estimate the postmortem interval. Pigs have become the most frequently used animal model in forensic science. The objective of this research was to identify the genera and/or species of necrophagous insects in the five stages of the cadaveric decomposition process, at the time of summer 2018 taking place in an urban area of Nuevo Chimbote (Ancash, Peru), using SusscrofaL. as an animal model. It was used a 12-kg pig carcass, recently euthanized and kept for 70 days, at an average temperature of 24.26°C and an average relative humidity of 66.96% inside a Schoenly-type trap to capture insects. Insects of the Diptera and Coleoptera orders were found in the different phases of decomposition: In the initial phase (two days) only dipterous insects, Sarcophagasp., Chrysomyaalbiceps, Cochliomyiamacellariaand Luciliacuprinawere identified; in the phase of active putrefaction(two days) the same species of diptera and coleoptera, Necrobiarufipesand Dermestesfrischii; in the advanced putrefaction phase (three days) the same species and also Muscadomesticadiptera; in the fermentation phase (11 days) the same species and also beetle Ammophorusperuvianus; and in the skeletonization phase (52 days) only beetles Saprinussp., Necrobiarufipesand Dermestesfrischiiwere identified. The results of this study indicate that in an open environment in an urban area of Nuevo Chimbote(Ancash, Peru), in summer season (January-March), the entomofauna was associated with the decomposition of S. scrofwhich is composed of five species of the order Diptera and four of the order Coleoptera. In addition, it was possible to observe that in the initial phase only diptera were present and in the final phase (skeletation) only coleoptera, which could be used as decomposition markers.
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