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The Ordovician period was home to six-foot sea scorpions, giant squid-like cephalopods with towering shells, and countless trilobites. But it also marked the first mass extinction in Earth’s history, wiping out 85% of all life. For the first time, animal life faced a global collapse on an unprecedented scale. The cause? A dramatic shift from intense global cooling to rapid warming. It was a devastating one-two punch. Full series on Colossal's YouTube. | Colossal Biosciences
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Arandaspis was an early jawless vertebrate (an arandaspid) from the Ordovician Period, living roughly 480 to 470 million years ago. Reaching about 15 cm (6 in) in length, it had bony armor covering the head and front part of the body, with a more weakly known tail region. It likely lived close to the seafloor and probably fed on small food particles or organisms taken in through its jawless mouth, although this feeding style is inferred from its anatomy rather than directly preserved evidence. I
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