Moscow State University, Moscow, Russia.
Dokl Biochem Biophys. 2022 Aug;505(1):166-169. doi: 10.1134/S1607672922040068. Epub 2022 Aug 29.
The structure of the brain of the smallest coleopteran, Scydosella musawasensis Hall, 1999, is described for the first time. As in other extremely small beetles, the brain of S. musawasensis displays signs of miniaturization: displacement to the thorax, compactization, and a small number and size of the neurons. The body size of the studied smallest beetle is similar to that of the minute hymenopteran Megaphragma, which has a nearly anucleate nervous system. However, the structure of the brain of the studied smallest beetle is similar to that of large representatives of the order and is characterized by a high number of nuclei in the brain and a significant volume of the cell body rind. The neuropil of S. musawasensis occupies 60% of the brain volume, confirming the neuropilar constant rule.
首次描述了最小鞘翅目昆虫 Scydosella musawasensis Hall, 1999 的大脑结构。与其他极其微小的甲虫一样，S. musawasensis 的大脑显示出了小型化的迹象：向胸部移位、紧凑化以及神经元数量和大小减少。所研究的最小甲虫的体型与具有几乎无核神经系统的微小膜翅目昆虫 Megaphragma 相似。然而，所研究的最小甲虫的大脑结构与该目的大型代表相似，其特点是大脑中有大量的核和显著的细胞体外皮体积。S. musawasensis 的神经胶占据了大脑体积的 60%，证实了神经胶常数规则。
