Horseshoe crabs
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First Triassic Horseshoe Crab Fossil Found in North America | Paleontology | Sci-News.com
Vaderlimulus tricki. This mostly complete and moderately well-preserved fossilized specimen is thought to represent the first Triassic horseshoe crab found in North America. The specimen came from a locality in the Olenekian Thaynes Group near Paris, Idaho, the United States. Image credit: New Mexico Museum of Natural History and Science.