Chronometrically morphological change of larvae of two species of necrophagous flies and its implication in forensic medicine
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Key Words：forensic entomology, Aldrichina grahami, Chrysomya megacephala, postmortem interval (PMI), cephalopharyngeal skeleton, spiracle
Abstract： In order to satisfy the need of deducing postmortem interval (PMI) through the larval age, anterior spiracle, posterior spiracle and cephalopharyngeal skeleton of Aldrichina grahami (Aldrich) and Chrysomya megacephala (Fabricius) larvae were investigated to select the indexes suitable for deducing larval age through digital image combined with the morphology surveying. The results showed these structures regularly changed with larval daily growth. The indexes, including the sclerotizes area of pharyngeal sclerite, the average optical density of pharyngeal sclerite and the posterior spiracle, could be used as the ideal markers of larval age. It could provide some scientific evidences for deducing the PMI exactly.