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也类似？——鞭蛛（无鞭目）的小眼轴突和视觉神经纤维网。

Also looking like ? - retinula axons and visual neuropils of Amblypygi (whip spiders).

作者信息

Lehmann Tobias, Melzer Roland R

机构信息

1Bavarian State Collection of Zoology - SNSB, Münchhausenstraße 21, 81247 Munich, Germany.

2Ludwig-Maximilians-Universität München, Department Biologie II, Großhaderner Straße 2, 82152, Planegg-Martinsried, Germany.

出版信息

Front Zool. 2018 Dec 19;15:52. doi: 10.1186/s12983-018-0293-6. eCollection 2018.

DOI:10.1186/s12983-018-0293-6
PMID:30574172
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6299927/
Abstract

BACKGROUND

Only a few studies have examined the visual systems of Amblypygi (whip spiders) until now. To get new insights suitable for phylogenetic analysis we studied the axonal trajectories and neuropil architecture of the visual systems of several whip spider species (, , , and ) with different neuroanatomical techniques. The R-cell axon terminals were identified with Cobalt fills. To describe the morphology of the visual neuropils and of the protocerebrum generally we used Wigglesworth stains and μCT.

RESULTS

The visual system of whip spiders comprises one pair of median and three pairs of lateral eyes. The R-cells of both eye types terminate each in a first and a second visual neuropil. Furthermore, a few R-cell fibres from the median eyes leave the second median eye visual neuropil and terminate in the second lateral eye neuropil. This means R-cell terminals from the lateral eyes and the median eyes overlap. Additionally, the arcuate body and the mushroom bodies are described.

CONCLUSIONS

A detailed comparison of our findings with previously studied chelicerate visual systems (i.e., Xiphosura, Scorpiones, Pseudoscorpiones, Opiliones, and Araneae) seem to support the idea of close evolutionary relationships between Xiphosura, Scorpiones, and Amblypygi.

摘要

背景

到目前为止，仅有少数研究对无鞭目（鞭蛛）的视觉系统进行过考察。为了获得适用于系统发育分析的新见解，我们运用不同的神经解剖学技术，研究了几种鞭蛛物种（、、、和）视觉系统的轴突轨迹和神经纤维网结构。通过钴填充法识别R细胞轴突终末。为了总体描述视觉神经纤维网和原脑的形态，我们使用了威格尔斯沃思染色法和μCT。

结果

鞭蛛的视觉系统由一对中眼和三对侧眼组成。两种眼型的R细胞均分别终止于第一和第二视觉神经纤维网。此外，来自中眼的一些R细胞纤维离开第二中眼视觉神经纤维网并终止于第二侧眼神经纤维网。这意味着来自侧眼和中眼的R细胞终末相互重叠。此外，还描述了弓状体和蕈形体。

结论

将我们的研究结果与先前研究的螯肢动物视觉系统（即剑尾目、蝎目、伪蝎目、盲蛛目和蜘蛛目）进行详细比较，似乎支持了剑尾目、蝎目和无鞭目之间存在密切进化关系的观点。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d266/6299927/03d3ac3172a4/12983_2018_293_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d266/6299927/f3b81f0c2189/12983_2018_293_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d266/6299927/7e88b200294b/12983_2018_293_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d266/6299927/c27b17ad1432/12983_2018_293_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d266/6299927/825ee363d537/12983_2018_293_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d266/6299927/9f61490087cf/12983_2018_293_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d266/6299927/9ae8afcca68e/12983_2018_293_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d266/6299927/03d3ac3172a4/12983_2018_293_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d266/6299927/f3b81f0c2189/12983_2018_293_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d266/6299927/7e88b200294b/12983_2018_293_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d266/6299927/c27b17ad1432/12983_2018_293_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d266/6299927/825ee363d537/12983_2018_293_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d266/6299927/9f61490087cf/12983_2018_293_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d266/6299927/9ae8afcca68e/12983_2018_293_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d266/6299927/03d3ac3172a4/12983_2018_293_Fig7_HTML.jpg

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