How the Sea Scorpion became the overlord of the earth

One

Hello everyone, I am Mu Mu said earth, today to introduce to you is a branch of an arthropod that appeared as early as the early Cambrian. Most of them are small characters on the edge, and their presence is extremely low, so low that even some Cambrian restorations will not appear. They are sparse in number and very small in size. In order to survive, they could only guard against the attacks of ferocious predators such as strange shrimp at that time, while grabbing food from the trilobites that were scattered all over the seabed at that time. But it is such a weak creature that has done what trilobites did not do until extinction, that is, the specialization of appendages, which simply means that their auxiliary limbs are not only used for walking and breathing. The appendages of early arthropods were generally composed of two parts, one for breathing and one for movement. But the part used to breathe is very delicate, and fast movement is bound to hurt the delicate part used to breathe. But the early crayons solved this problem, that is, specialization, the first six pairs of appendages for movement, and all the remaining appendages evolved into "book cheeks" for breathing. In addition, their first pair of appendages evolved into claws, which are small forceps that assist feeding, and from then on they did not have to eat like trilobites and swallowed them, which is why they are called chelates.

Two

With the advanced appendages of the crayons, they occupy higher positions in the food chain, and their size and strength and speed increase. Finally, in the Ordovician, a class of cheets completed the most important evolution in the history of cheetists, and since then the nemesis of the odd shrimp and the nightmare sea scorpion of marine life has been born. The official name of the sea scorpion is the plate-footed horseshoe crab. They call them sea scorpions because their size is no different from the scorpions we can see today, and in order to become well-deserved ocean overlords, sea scorpions have transformed the six pairs of appendages they use to move into a variety of ferocious weapons plus their hard exoskeletons have begun to have the temperament of the sea overlords, but what pushes the sea scorpions to the peak is the first biological mass extinction in the history of animals we know as "the ordovician extinction". On the earth at that time, the sudden rise and fall of sea level made the trilobites at that time a kind of toss and choke, but the sea scorpion became the ultimate winner of the mass extinction with its ability to dominate the ocean, and in the ruins after the extinction, the sea scorpion family rose first, and since then the presence of the sea scorpion in the ocean is like a fish in the ocean now, everywhere. In the 40 million years from the Silurian to the Devonian, the sea scorpion was the deserved overlord of the ocean, the absolute C position.

Three

However, just after the Earth entered the Devonian Period, fish evolved solid armor and the ability to move quickly to fight sea scorpions, and finally, a jawed fish evolved a "nuclear weapon" - the jaw. Large jawed fish can easily bite the armor of sea scorpions with their sharp teeth, and small jawed fish can easily grab the food of sea scorpions with their efficient athletic ability. It only took about 10 million years for the sea scorpions in the ocean to be "cleanly killed" by the jawed fish, and the sea scorpion had no choice but to retreat to the fresh water to survive, but the jawed fish soon attacked the fresh water, and the sea scorpion had no choice but to regret it. But the story does not end here, in the Ordovician, one of the cheetus landed on land, they evolved into today's arachnids, into today's scorpions and spiders, and continue to write the glorious legend of their ancestors in the ocean on the land.