已知最小的昆虫【和单细胞原生生物差不多大】

以下照片是在等比例尺下的比较。B是草履虫(Paramecium caudatum). C是阿米巴原虫(Amoeba proteus).
为了能够如此之小,生理上也有些特殊之处。
比如整个中枢神经系统中只有 339–372 个细胞核,存在有很多无细胞核的神经细胞。
难道最小的昆虫同时也是最**的昆虫?
I
Polilov, A.A., 2012. The smallest insects evolve anucleate neurons. Arthropod structure & development, 41(1), pp.29-34.


Abstract
The smallest insects are comparable in size to unicellular organisms. Thus, their size affects their structure not only at the organ level, but also at the cellular level. Here we report the first finding of animals with an almost entirely anucleate nervous system. Adults of the smallest flying insects of the parasitic wasp genus Megaphragma (Hymenoptera: Trichogrammatidae) have only 339–372 nuclei in the central nervous system, i.e., their ganglia, including the brain, consist almost exclusively of processes of neurons. In contrast, their pupae have ganglia more typical of other insects, with about 7400 nuclei in the central nervous system. During the final phases of pupal development, most neuronal cell bodies lyse. As adults, these insects have many fewer nucleated neurons, a small number of cell bodies in different stages of lysis, and about 7000 anucleate cells. Although most neurons lack nuclei, these insects exhibit many important behaviors, including flight and searching for hosts.

楼主 Reformatskies  发布于 2018-09-11 04:48:00 +0800 CST  

楼主:Reformatskies

字数:1283

发表时间:2018-09-11 12:48:00 +0800 CST

更新时间:2020-12-22 11:31:06 +0800 CST

评论数:15条评论

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