Megaselia spiracularis Schmitz, 1938 (Diptera: Phoridae) is a pest that often appears in human living areas where it can spread pathogens. Besides, the species is of forensic value. Currently, studies focusing on the development of this species are limited. Understanding the developmental patterns of M. spiracularis, therefore, is important for controlling populations of this pest and for estimating the minimum postmortem interval (PMImin). Here, we studied the development of M. spiracularis exposed to seven constant temperatures ranging from 16 to 34 °C. The developmental durations, accumulated degree hours and larval body length changes were measured. Three kinds of development models that can be used to estimate the PMImin were established, including isomorphen diagram, isomegalen diagram and thermal summation model. The duration of M. spiracularis development at 16, 19, 22, 25, 28, 31 and 34 °C from egg to adult stage were 1131.1 ± 34.5, 807.3 ± 9.3, 529.6 ± 1.8, 367.0 ± 8.8, 302.4 ± 7.0, 250.0 ± 2.1 and 232.6 ± 1.9 h, respectively. The developmental threshold temperature and the thermal summation constant were estimated as 12.0 ± 0.5 °C and 4989.7 ± 308.9° hours, respectively. A general model represented by a logistic equation describing how larval body length will change with the time after hatching was fit to data. The present study provides basic developmental data of M. spiracularis, which can be used for achieving better control of this noxious insect as well as for estimation of its PMImin at different temperatures.

中文翻译：

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Megaselia spiracularis（双翅目：Phoridae）在不同恒温条件下的发育

Megaselia spiracularis Schmitz，1938（双翅目：Phoridae）是一种经常出现在人类生活区的害虫，它可以传播病原体。此外，该物种具有法医价值。目前，专注于该物种发展的研究是有限的。因此，了解 M. spiracularis 的发育模式对于控制这种害虫的种群和估计最小死后间隔 (PMImin) 非常重要。在这里，我们研究了暴露于 16 至 34 °C 的七个恒定温度下的 M. spiracularis 的发育。测量了发育持续时间、累积度数和幼虫体长变化。建立了三种可用于估计PMImin的发展模型，包括同形素图、等离子图和热求和模型。M的持续时间 从卵到成虫阶段在 16、19、22、25、28、31 和 34°C 下的螺旋藻发育为 1131.1 ± 34.5、807.3 ± 9.3、529.6 ± 1.8、367.0 ± 8.8、307.0 ± 2 ± 2 和 2 ± 2 ±2。分别为 1.9 小时。发育阈温度和热总和常数分别估计为 12.0 ± 0.5 °C 和 4989.7 ± 308.9° 小时。由逻辑方程表示的一般模型，描述了孵化后幼虫体长如何随时间变化，与数据拟合。本研究提供了螺旋藻的基本发育数据，可用于更好地控制这种有毒昆虫以及估计其在不同温度下的 PMImin。分别为 1 和 232.6 ± 1.9 小时。发育阈温度和热总和常数分别估计为 12.0 ± 0.5 °C 和 4989.7 ± 308.9° 小时。由逻辑方程表示的一般模型，描述了孵化后幼虫体长如何随时间变化，与数据拟合。本研究提供了螺旋藻的基本发育数据，可用于更好地控制这种有毒昆虫以及估计其在不同温度下的 PMImin。分别为 1 和 232.6 ± 1.9 小时。发育阈温度和热总和常数分别估计为 12.0 ± 0.5 °C 和 4989.7 ± 308.9° 小时。由逻辑方程表示的一般模型，描述孵化后幼虫体长如何随时间变化，与数据拟合。本研究提供了螺旋藻的基本发育数据，可用于更好地控制这种有毒昆虫以及估计其在不同温度下的 PMImin。