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21141 Premium Grade Soft Bodied Xiphosurid (Horseshoe Crab Ancestor) Lower Ordovician Ammonites Even the genus identification is Even the genus identification is very complicated if only dentition rests are available See also Sepkoski 2002 The shelly fossil record shows a well recognized pattern of macroevolutionary stasis between the Cambrian Explosion and the Great Ordovician Biodiversification Event actually arachnids
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