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The trilobite's body is further divided into three regions: the cephalon (head)
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each of which grew out of a separate spinal vertebra (a bone in the back)
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Priscacara, Green River Fossil Fish Ouranosaurus The trilobite's body is furtherThe genus Priscacara is perhaps the most popular of the Green River fish fossils. A member of the Family Priscacaridae, the name Priscacara means "primitive head". Shaped rather like a sunfish, the genus sports sturdy, protective dorsal and anal spines. Among the two species, liops and serrata, serrata is uncommon. Liops is the smaller species, never exceeding 6 inches, whereas serrata have been found up to 14 inches. The genus went extinct at the end