アメリカ自然史博物館のインスタグラム(amnh) - 3月22日 06時06分

It's time for #TrilobiteTuesday! By the time the Cambrian period began producing an incredible array of strange and previously unseen fauna some 521 million years ago, trilobites were already advanced organisms possessing both hard exoskeletons and highly developed eyes. From the moment their calcified carapaces started filling the fossil record near the dawn of the hallowed Cambrian Explosion, trilobites were one of the dominant life forms swimming in the earth's ancient seas. These strangely beautiful creatures—named not for their distinctive cephalon, thorax, and pygidium (head, body, tail), but rather for the three lobes that divide their lateral symmetry—would eventually evolve into more than 25,000 scientifically recognized forms, such as this Irvingella from the Upper Cambrian of British Columbia, and command the world's oceans for the next quarter of a billion years.

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