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21150 Great Soft Bodied 2 Xiphosurids (Horseshoe Crab Ancestor) Lower Ordovician Eocrinoids Beautiful specimen with one tooth Beautiful specimen with one tooth and the matrix is below to 70 μm The most notable difference between ancient and modern forms is that the abdominal segments in present species are fused into a single unit in adults the modern horseshoe crabs look almost identical to prehistoric genera such as the Jurassic Mesolimulus
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