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21170 Premium Grade Soft Bodied Xiphosurid (Horseshoe Crab Ancestor) Lower Ordovician Onchopristis Impressive example of this Devonian Impressive example of this Devonian cephalopod (ammonite) 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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