Entomological evidence can be utilized in forensic investigation to estimate the elapsed time after death or minimum post mortem interval estimation (PMI min ). This estimation is based on the age of dipterous specimens feeding on decomposing human tissues, which commonly refers to their larval body length. The objective of this research was to look for alternatives to larval body length which could be impaired by specimen handling and subsequently causing inaccuracy in PMI min estimation. In this research, development of forensic blow fly, Hemipyrellia ligurriens (Wiedemann) (Diptera: Calliphoridae), based on larval cephalopharyngeal skeleton length, was described for the first time. Development of H. ligurriens was represented by body length and cephalopharyngeal skeleton consisting anterodorsal process to dorsal cornu (ADP-DC), anterodorsal process to ventral cornu (ADP-VC) and dorsal cornu to ventral cornu (DC-VC). The cephalopharyngeal skeletons proportionally developed with larval body development, but periods of plateau existed between 0 and 10 h and 24-30 h, suggesting ecdysis periods of larvae. Data measurements were more consistent in cephalopharyngeal skeleton length than in larval body length, and there were strong positive significant correlations, r > 0.85 (p < 0.05). These findings warranted further investigations to examine cephalopharyngeal skeleton as an alternative growth parameter to larval body length.
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