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21139 Premium Grade Soft Bodied Xiphosurid (Horseshoe Crab Ancestor) Lower Ordovician Toletanaspis Ancyropyge Ancyropyge Globidensini Russell 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 It comes from The Konservat Lagerstätten of Lower Fezouata Fm that spans the entire Tremadoc stage of the Ordovician system and is only present in the Moroccan Anti Atlas
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