The Siluria3 - were chelicerates, the group of arthropods...

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The Silurian Stromatoporoids, once thought to be coral, but actually sponges, continued their significant role in Silurian reefs. Some stromatoporoid specimens are over 16 feet in diameter. Stromatoporoids finally went extinct at the end of the Cretaceous extinction. One arthropod group became more diverse during the Silurian and Devonian times, the eurypterids, or sea scorpions. The oldest fossil eurypterids are from the Ordovician, but the group increased in species number and size during the Silurian- Devonian before its eventual extinction at the close of the Permian. Eurypterids
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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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The Siluria3 - were chelicerates, the group of arthropods...

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