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Unformatted text preview: were chelicerates, the group of arthropods that includes the spiders and scorpions. Eurypterids were among the major swimming predators of the Silurian-Devonian seas. Eurypterids are so common in the Silurian rocks of New York that they are the state fossil. Fish continued to divesify, with the oldest jawed fish, the placoderms, joining the ostracoderms and acanthodian fish. The great explosion of these fish groups would occur during the Devonian period. During the Silurian, however, fish established themselves in both marine and freshwater environments....
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- Fall '10