Fossil is the oldest-known scorpion
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Biology, Free Full-Text
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Researchers Find Fossil of 400-Million-Year-Old, Dog-Sized Sea Scorpion
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Fossils Reveal Oldest Known Human-Sized 'Sea Scorpion
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Insights into the 400 million-year-old eyes of giant sea scorpions (Eurypterida) suggest the structure of Palaeozoic compound eyes
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Prehistoric scorpion one of the first creatures to scuttle onto dry land - BBC Science Focus Magazine
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Earliest Sea Scorpion Tracks on Land
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Oldest Scorpion Fossil Discovered
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436-Million-Year-Old Scorpion Was Among the Planet's First Air Breathers
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PPT - Scorpions PowerPoint Presentation, free download - ID:1265595
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Ancient fossil 'may prove scorpion was first land-dwelling animal', Fossils
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Episode 156 – Eurypterids (Sea Scorpions) – The Common Descent Podcast