アメリカ自然史博物館のインスタグラム(amnh) - 3月1日 05時22分

It's time for #TrilobiteTuesday! As superficially similar as some trilobites may appear to certain contemporary creatures—perhaps most notably, isopods and horseshoe crabs—any similarities are nothing more than shell deep. In fact, trilobites have no direct living relatives, and while they do share many of the key characteristics of the arthropod phylum with everything from brine shrimp to wood lice, their primeval morphology marks their members as a totally unique line of the planet's family tree. So when you look at the fossilized remains of a trilobite, whether it is a one-inch Cambrian Elrathia kingi, or a seven inch Silurian Trimerus delphinocephalus (pictured here), please consider that lurking under those imposing calcite carapaces were creatures that represented one of our planet's first and most successful experiments with life.

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