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Structure and function of a compound eye more than half a billion years old

机译:超过十亿年历史的复眼的结构和功能

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摘要

Until now, the fossil record has not been capable of revealing any details of the mechanisms of complex vision at the beginning of metazoan evolution. Here, we describe functional units, at a cellular level, of a compound eye from the base of the Cambrian, more than half a billion years old. Remains of early Cambrian arthropods showed the external lattices of enormous compound eyes, but not the internal structures or anything about how those compound eyes may have functioned. In a phosphatized trilobite eye from the lower Cambrian of the Baltic, we found lithified remnants of cellular systems, typical of a modern focal apposition eye, similar to those of a bee or dragonfly. This shows that sophisticated eyes already existed at the beginning of the fossil record of higher organisms, while the differences between the ancient system and the internal structures of a modern apposition compound eye open important insights into the evolution of vision.
机译:到目前为止,化石记录尚无法揭示后生动物演化初期复杂视觉机制的任何细节。在这里,我们描述了超过五亿年前的寒武纪基地复眼在细胞水平上的功能单元。早期寒武纪节肢动物的遗迹显示出巨大复眼的外部晶格,但未显示内部结构或有关这些复眼可能如何运作的任何信息。在波罗的海下寒武纪的磷化三叶虫眼中,我们发现了蜂窝状系统的残余物,这是典型的现代对位眼,类似于蜜蜂或蜻蜓。这表明,高级生物的化石记录开始时已经存在复杂的眼睛,而古代系统与现代并置复眼的内部结构之间的差异为视觉的发展打开了重要的视野。

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