Intrapuparial Development of Sarconesia Chlorogaster (Diptera: Calliphoridae) for Postmortem Interval Estimation...

Area of Science:

• Forensic Entomology
• Entomology
• Developmental Biology

Background:

• Sarconesia chlorogaster (Diptera: Calliphoridae) is a blow fly species endemic to South America with significant forensic importance.
• The pupal stage constitutes approximately 70% of the total immature development time for this species.
• Refining the analysis of pupal development can enhance the accuracy of minimum postmortem interval (PMI) estimations.

Purpose of the Study:

• To identify and describe the temporal intrapuparial morphological changes of Sarconesia chlorogaster.
• To establish a baseline for using these morphological changes in forensic age estimations.

Main Methods:

• Sarconesia chlorogaster were reared on an artificial diet at constant temperatures of 20°C and 25°C.
• Pupae were sampled every 8 hours, fixed, and their external morphology documented through photography and description.
• Twenty-nine morphological characteristics were assessed for their potential to estimate age.

Main Results:

• Thirteen of the 29 described morphological characteristics were identified as potentially informative for age estimation.
• Key informative characteristics include body shape, coloration, mouth hook visibility, thoracic appendages, eye color changes, and bristle development.
• Distinct morphological changes occur throughout the intrapuparial stage, providing age-related markers.

Conclusions:

• The identified intrapuparial morphological characteristics of Sarconesia chlorogaster can be utilized to estimate the postmortem interval.
• This research expands the available tools for forensic entomologists in South America, improving PMI accuracy.
• Detailed morphological staging of S. chlorogaster pupae offers a reliable method for forensic casework.