Fossil is the oldest-known scorpion

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Researchers Find Fossil of 400-Million-Year-Old, Dog-Sized Sea Scorpion

Fossils Reveal Oldest Known Human-Sized 'Sea Scorpion

Insights into the 400 million-year-old eyes of giant sea scorpions (Eurypterida) suggest the structure of Palaeozoic compound eyes

Prehistoric scorpion one of the first creatures to scuttle onto dry land - BBC Science Focus Magazine

Earliest Sea Scorpion Tracks on Land

Oldest Scorpion Fossil Discovered

436-Million-Year-Old Scorpion Was Among the Planet's First Air Breathers

PPT - Scorpions PowerPoint Presentation, free download - ID:1265595

Ancient fossil 'may prove scorpion was first land-dwelling animal', Fossils

Episode 156 – Eurypterids (Sea Scorpions) – The Common Descent Podcast