Department of Forensic Medicine, Soochow University, Suzhou, China.
School of Forensic Medicine, Wannan Medical College, Wuhu, China.
J Med Entomol. 2020 Sep 7;57(5):1373-1381. doi: 10.1093/jme/tjaa046.
Forensic entomologists usually estimate the minimum postmortem interval (PMImin) using the time required for the oldest immature insects found on the corpse to grow to its development stage and age at the time of discovery. The sheep blow fly Lucilia sericata (Meigen, 1826) is a carrion fly found nearly worldwide, and important in forensics. We studied the development time of L. sericata from egg to adult at constant temperatures of 16, 19, 22, 25, 28, 31, and 34°C, and found that the times required are 913.2 ± 19.4, 588.8 ± 35.8, 459.8 ± 15.2, 373.2 ± 15.3, 308.0 ± 9.7, 272.5 ± 9.2, and 267.5 ± 10.5 h, respectively. We established three development models to infer the age of the immature insect: isomegalen diagram, isomorphen diagram, and thermal summation model. In addition, a regression analysis was performed on the relationship between body length and total development time from hatching to dispersing. The thermal summation constant during the development of L. sericata is 6023.2 degree hours and development threshold temperature is 9.19°C. The results of this experiment provide a basis for the use of L. sericata in the estimation of PMImin.
法医昆虫学家通常通过估计尸体上发现的最古老的未成熟昆虫发育到其发育阶段所需的时间，并结合发现时的年龄来估计最小死后间隔时间（PMImin）。丝光绿蝇（Lucilia sericata）是一种几乎在全球范围内都有发现的腐肉蝇，在法医学中非常重要。我们研究了 L. sericata 在 16、19、22、25、28、31 和 34°C 恒温下从卵到成虫的发育时间，发现所需时间分别为 913.2 ± 19.4、588.8 ± 35.8、459.8 ± 15.2、373.2 ± 15.3、308.0 ± 9.7、272.5 ± 9.2 和 267.5 ± 10.5 h。我们建立了三个发育模型来推断未成熟昆虫的年龄：等积图、等态图和热总和模型。此外，还对孵化到分散期间体长与总发育时间之间的关系进行了回归分析。L. sericata 发育过程中的热总和常数为 6023.2 度小时，发育阈值温度为 9.19°C。本实验结果为 L. sericata 在估计 PMImin 中的应用提供了依据。
