アメリカ自然史博物館のインスタグラム(amnh) - 12月28日 00時50分

It's time for #TrilobiteTuesday! During their lengthy trek through time, trilobites existed in an almost dizzying array of sizes and shapes. Perhaps no other creature in the entire history of the earth has ever displayed the diversity of design shown by these singularly distinctive arthropods. But at their heart (and yes, trilobites apparently did possess primitive but effective cardio-respiratory systems), they were all remarkably similar. Whether they were Cambrian Olenellids -- such as this Olenellus romensis from Alabama -- or Devonian Phacopids, most trilobites presented a fundamentally analogous body design.

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