Core Viewpoint - A research team from Yunnan University published findings in the journal "Nature," revealing that early vertebrates possessed four camera-type eyes, providing new insights into the evolution of their visual systems and ecological adaptation strategies [1]. Group 1: Research Findings - The study, led by academicians from Yunnan University and the Chinese Academy of Sciences, describes two fossilized fish species from the Cambrian period (approximately 518 million years ago) and identifies pigment structures between their lateral eyes as part of a pineal complex [1]. - The research provides morphological and fossil molecular signal evidence that confirms the presence of a complete imaging system in the earliest known vertebrates, with the pineal complex containing melanin-rich retinas and lenses [1]. Group 2: Evolutionary Implications - Further analysis of another vertebrate fossil from the Burgess Shale indicates it also had a pair of lateral eyes and smaller pineal eyes, suggesting that the pineal complex was a pair of imaging camera-type eyes during the ancestral stage of vertebrates [2]. - The study posits that the Cambrian explosion, characterized by rapid environmental changes and morphological innovations, was driven by the emergence of predation, which likely influenced the evolution of sensory systems in early vertebrates [2].