Variations on a theme: Morphological variation in the secondary eye visual pathway across the order of Araneae
Variations on a theme: Morphological variation in the secondary eye visual pathway across the order of Araneae
复制标题
DOI：
10.1002/cne.24945
复制
发表时间：
2021-02-01
影响因子：
2.5
通讯作者：
Long, Skye M.
中科院分区：
文献类型：
--
作者：
Long, Skye M.
蜘蛛拥有一系列广泛的感觉驱动行为，因此为研究大脑形态、感觉系统和行为之间关系的进化假设提供了丰富的模型。尽管如此，只有少数研究考察了蜘蛛目动物大脑的差异。在这项研究中，我描述了19个蜘蛛科的大体大脑形态，这些蜘蛛科的眼睛形态各不相同。蜘蛛在第二眼视觉通路上表现出最大的变化。基于这种变异，蜘蛛可以分为四类。第一组蜘蛛有小而不发达的片层，没有髓质，没有蘑菇体。2组蜘蛛纹层大，无髓质，蘑菇体大。第3组蜘蛛有纹层，有一些证据表明髓质和蘑菇体减少。第4组蜘蛛的系统最复杂，有大的片层、由光学肾小球形成的髓质和强壮的蘑菇体。在组内，单个区域的形状和大小存在很大差异，表明神经元组织可能存在差异。本文还讨论了蜘蛛失去专用嗅觉器官的可能的进化意义及其对蘑菇体的影响。
Spiders possess a wide array of sensory-driven behaviors and therefore provide rich models for studying evolutionary hypotheses about the relationship between brain morphology, sensory systems, and behavior. Despite this, only a handful of studies have examined brain variation across the order of Araneae. In this study, I present descriptions of the gross brain morphology for 19 families of spiders that vary in eye morphology. Spiders showed the most variation in the secondary eye visual pathway. Based on this variation, spiders could be categorized into four groups. Group 1 spiders had small, underdeveloped laminae, no medullae, and no mushroom bodies. Group 2 spiders had large laminae, no medullae and large mushroom bodies. Group 3 spiders had laminae and some evidence of reduced medullae and mushroom bodies. Group 4 spiders had the most complex systems, with large laminae, medullae formed from optical glomeruli, and robust mushroom bodies. Within groups, there was large variation in the shape and size of individual regions, indicating possible variation in neuronal organization. The possible evolutionary implications of the loss of a dedicated olfactory organ in spiders and its effects on the mushroom body are also discussed.