First report of the forensically important fly, Stearibia nigriceps (Diptera: Piophilidae) in South Korea: Confirmation of specimens from human corpses based on cytochrome c oxidase subunit I barcodes.

Piophilidae are a relatively small family of Diptera that is frequently associated with cadavers at advanced stages of decomposition and are, therefore, considered potentially useful forensic indicators. However, their use in forensic investigations is typically hampered by a deficiency in reliable identification tools. This is particularly evident in countries such as South Korea, where forensic entomology is still in its infancy and the diversity of forensically relevant insect taxa remains largely undocumented. In the present study, we used cytochrome c oxidase subunit I (COI) barcodes to identify samples of piophilid larvae collected during medicolegal investigations performed in South Korea. A total of 174 COI sequences were obtained and have been made publicly available, thus augmenting the reference barcode library for forensically important Piophilidae species. Of the 174 sequenced samples, 172 were identified as Stearibia nigriceps (Meigen), whereas the two remaining samples may represent a previously unsequenced piophilid species. Stearibia nigriceps is recorded from South Korea for the first time, and our results suggest that it might be a particularly relevant forensic indicator in certain case types and scenarios in that country. The findings of this study highlight the utility of COI barcodes for achieving accurate identification of entomological samples, even by non-specialist forensic practitioners. They also contribute to the further development and consolidation of forensic entomology in South Korea and eastern Asia.