アメリカ自然史博物館のインスタグラム(amnh) - 8月30日 06時34分

It's time for Trilobite Tuesday! Few morphological features in the entire fossil record are as singularly significant as trilobite eyes. By the time the initial members of the trilobite line appeared early in the Cambrian, slightly more than 520 million years ago, many of those arthropods already featured highly developed eyes -- marking them as the first animals in Earth's 4.54-billion-year history capable of leaving behind tangible evidence of such a major evolutionary advance. Those original eyes were crescent-shaped and, in most cases, seemingly provided nearly 360-degree vision for the primitive trilobite types such as Olenellus transitans (pictured here) and Redlichia takooensis, which sported them. #trilobite #trilobites #trilobitetuesday #amnh #naturalhistory #fossil #fossils

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