Sea Scorpion Fossil 

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The typical eurypterid had a large, flat, semicircular carapace, followed by a jointed section, and finally a tapering, flexible tail, most ending with a long spine ... Read more at the end (Pterygotus, though, had a large flat tail, possibly with a smaller spine). Behind the head, eurypterids had twelve body segments, each of which was formed from a dorsal plate (tergite) and a ventral plate (sternite). The tail, known as the telson, is spiked in most eurypterids (just like in modern scorpions) and in some species it may have been used to inject venom, but so far there is no certain evidence that any eurypterids were venomous. Most eurypterids have paddles toward the end of the carapace and beyond, which were used to propel themselves through water. The suborder Stylonurina have walking legs instead of paddles. Some argue that the paddles were also used for digging. Underneath, in addition to the pair of swimming appendages, the creature had four pairs of jointed legs for walking, and two claws at the front, chelicerae, which were enlarged in pterygotids. The walking legs had odd hairs, similar to modern day crabs. Other features, common to ancient and modern arthropods of this type, include one pair of compound eyes and a pair of smaller eyes, called ocelli, located between the other larger pair of eyes.

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