Comparative analysis of deutocerebral neuropils in Chilopoda (Myriapoda): implications for the evolution of the arthropod olfactory system and support for the Mandibulata concept.
Comparative analysis of deutocerebral neuropils in Chilopoda (Myriapoda): implications for the evolution of the arthropod olfactory system and support for the Mandibulata concept.
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DOI：
10.1186/1471-2202-13-1
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发表时间：
2012-01-03
期刊：
影响因子：
2.4
通讯作者：
Harzsch S
中科院分区：
文献类型：
--
作者：
Sombke A;Lipke E;Kenning M;Müller CH;Hansson BS;Harzsch S
起源于海洋的多足动物很可能独立于六足动物入侵陆地。由于这两种进化谱系是平行而独立地征服陆地的，我们有兴趣将多足动物的化学感觉系统与六足动物的化学感觉系统进行比较，以深入了解它们对空气中嗅觉的可能适应。我们的研究与之前对足类动物（蜈蚣）Scutigera coleoptrata的大脑和行为的分析相联系，我们证明了这些动物确实对挥发性物质有反应，并分析了它们的中央嗅觉通路的结构。在这里，我们通过组织学、共聚焦激光扫描显微镜和3D重建，研究了另外七个Chilopoda的代表动物的下脑脑区（处理来自触角的输入）的结构。我们发现，在我们研究的所有物种中，大多数触角传入事件针对两个独立的神经丸，嗅叶（化学感觉，由肾小球神经丸室组成）和板状体（机械感觉）。嗅肾小球的数量在35 ~ 90个之间，其形状从球形到卵球形或水滴形到细长形不等。甲壳类和六足类动物也有从第一对触角分离出化学感觉和机械感觉信号的特征，但螯角类动物没有这种特征。我们认为这个字符集强烈支持下颌纲假说（多足纲+（甲壳纲+六足纲）），而不是多足纲+螯合纲概念（多足纲+螯合纲）。我们的发现的进化意义，特别是肾小球形状的可塑性，进行了讨论。
Originating from a marine ancestor, the myriapods most likely invaded land independently of the hexapods. As these two evolutionary lineages conquered land in parallel but separately, we are interested in comparing the myriapod chemosensory system to that of hexapods to gain insights into possible adaptations for olfaction in air. Our study connects to a previous analysis of the brain and behavior of the chilopod (centipede) Scutigera coleoptrata in which we demonstrated that these animals do respond to volatile substances and analyzed the structure of their central olfactory pathway. Here, we examined the architecture of the deutocerebral brain areas (which process input from the antennae) in seven additional representatives of the Chilopoda, covering all major subtaxa, by histology, confocal laser-scan microscopy, and 3D reconstruction. We found that in all species that we studied the majority of antennal afferents target two separate neuropils, the olfactory lobe (chemosensory, composed of glomerular neuropil compartments) and the corpus lamellosum (mechanosensory). The numbers of olfactory glomeruli in the different chilopod taxa ranged from ca. 35 up to ca. 90 and the shape of the glomeruli ranged from spheroid across ovoid or drop-shape to elongate. A split of the afferents from the (first) pair of antennae into separate chemosensory and mechanosensory components is also typical for Crustacea and Hexapoda, but this set of characters is absent in Chelicerata. We suggest that this character set strongly supports the Mandibulata hypothesis (Myriapoda + (Crustacea + Hexapoda)) as opposed to the Myriochelata concept (Myriapoda + Chelicerata). The evolutionary implications of our findings, particularly the plasticity of glomerular shape, are discussed.
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DOI：
10.1073/pnas.0306212101
发表时间：
2004-03-16
影响因子：
11.1
作者：
Fanenbruck, M;Harzsch, S;Wägele, JW
通讯作者：
Wägele, JW
影响因子：
3.5
作者：
FONTA, C;SUN, XJ;MASSON, C
通讯作者：
MASSON, C
影响因子：
9.2
作者：
Dekker, T;Ibba, I;Hansson, BS
通讯作者：
Hansson, BS
影响因子：
2.5
作者：
Beltz, BS;Kordas, K;Sandeman, DC
通讯作者：
Sandeman, DC
影响因子：
3.6
作者：
ARNOLD, G;MASSON, C;BUDHARUGSA, S
通讯作者：
BUDHARUGSA, S