Identifying 1st instar larvae for three forensically important blowfly species using “fingerprint” cuticular hydrocarbon analysis

Moore, Hannah E.; Adam, Craig D.; Drijfhout, Falko P.

Abstract

Calliphoridae are known to be the most forensically important insects when it comes to establishing the minimum post mortem interval (PMImin) in criminal investigations. The first step in calculating the PMImin is to identify the larvae present to species level. Accurate identification which is conventionally carried out by morphological analysis is crucial because different insects have different life stage timings. Rapid identification in the immature larvae stages would drastically cut time in criminal investigations as it would eliminate the need to rear larvae to adult flies to determine the species. Cuticular hydrocarbon analysis on 1st instar larvae has been applied to three forensically important blowflies; Lucilia sericata, Calliphora vicina and Calliphora vomitoria, using gas chromatography–mass spectrometry (GC–MS) and principal component analysis (PCA). The results show that each species holds a distinct “fingerprint” hydrocarbon profile, allowing for accurate identification to be established in 1-day old larvae, when it can be challenging to apply morphological criteria. Consequently, this GC–MS based technique could accelerate and strengthen the identification process, not only for forensically important species, but also for other entomological samples which are hard to identify using morphological features.

Citation

Moore, H. E., Adam, C. D., & Drijfhout, F. P. (2014). Identifying 1st instar larvae for three forensically important blowfly species using “fingerprint” cuticular hydrocarbon analysis. Forensic Science International, 240, 48-53. https://doi.org/10.1016/j.forsciint.2014.04.002

• Journal Article Type: Article
• Acceptance Date: Apr 4, 2014
• Online Publication Date: Apr 14, 2014
• Publication Date: 2014-07
• Deposit Date: Jun 16, 2023
• Journal: Forensic Science International
• Print ISSN: 0379-0738
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 240
• Pages: 48-53
• DOI: https://doi.org/10.1016/j.forsciint.2014.04.002
• Keywords: Pathology and Forensic Medicine; Law; Forensic entomology; Calliphoridae; Blowflies; Cuticular hydrocarbons; Gas chromatography–mass spectrometry; Principal component analysis
• Additional Information: This article is maintained by: Elsevier; Article Title: Identifying 1st instar larvae for three forensically important blowfly species using “fingerprint” cuticular hydrocarbon analysis; Journal Title: Forensic Science International; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.forsciint.2014.04.002; Content Type: article; Copyright: Copyright © 2014 Elsevier Ireland Ltd. All rights reserved.