Extraordinary fossils of 518-million-year-old jawless fish, among the earliest known vertebrates, appear to show that these animals had two pairs of eyes
Več na: https://www.newscientist.com/article/2512668-our-earliest-vertebrate-ancestors-may-have-had-four-eyes/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home
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