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21139 Premium Grade Soft Bodied Xiphosurid (Horseshoe Crab Ancestor) Lower Ordovician Toletanaspis transition zone lower shoreface (2) transition zone lower shoreface (2) pterygoid with short palatine process at about 45° relative to the ectopterygoid process The shelly fossil record shows a well recognized pattern of macroevolutionary stasis between the Cambrian Explosion and the Great Ordovician Biodiversification Event according to one recent study
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