【目的】 磁性颗粒是一些生物感知地磁场变化的重要物质，也是夜间远距离迁飞昆虫地磁定向的重要机制之一。本研究以迁飞性害虫粘虫蛾Mythimna separata为研究对象，对其体内潜在磁性颗粒进行检测。【方法】 利用超导量子磁强计SQUID初步检测粘虫成虫体内的磁性颗粒，并将经普鲁士蓝染色后的虫体石蜡切片于正置BX61研究级显微镜下观察磁性颗粒的分布状况。【结果】 SQUID检测发现，相比于头部的磁滞曲线，粘虫腹部具有微弱的磁性，推测粘虫腹部可能具有磁性颗粒。进一步经显微镜观察表明，虫体腹部有明显的普鲁士蓝染色沉淀，证明粘虫蛾腹部存在铁磁性颗粒物质。【结论】 粘虫蛾腹部可能是其感应地磁场变化以及地磁定向的重要部位。

[Objectives]  Magnetic particles are important for some organisms to sense changes in the geomagnetic field. They are also one of the important geomagnetic orientation mechanisms used by insects during long distance nocturnal migration. In this study, the locations of magnetic particles in adult oriental armyworms, Mythimna separata, a nocturnal migratory insect pest in China, were identified. [Methods]  SQUID was used to detect magnetic particles in the heads and abdomens of adult M. separata, and a standard BX61 microscope and Prussian blue stain were used to observe the distribution of magnetic particles in the abdomen. [Results]  The abdomen was weakly magnetic relative to the hysteresis loop in the head, indicating that there may be magnetic particles in the abdomen of adult M. separata. Furthermore, microscopic observation revealed obvious Prussian blue precipitation in the abdomen. These results demonstrate that there are ferromagnetic particles in the abdomen of adult M. separata. [Conclution]  The adult abdomen could be important for sensing the geomagnetic field and for geomagnetic orientation in this species.