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for instance
Our Lithostrotionella is from the Mississippian Period (350 million years) of West Virginia
Originally interpreted as an alga
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In these respects
Eurypterus remipes, with frame, Siluria Ouranosaurus for instanceEurypterids, or water scorpions, were aquatic predators that thrived until the end of the Paleozoic Era for about 250 million years. Eurypterids primarily lived in brackish water in lagoons and estuaries, feeding on everything from mollusks to primitive fish. According to fossil trackways found in Australia, eurypterids could also spend time on land, and were likely the first animals to leave the water. Eurypterids are part of an extinct order of
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