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Description:

Why did some types of trilobites "roll up?"

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      Keywords:

      NSDL_SetSpec_ncs-NSDL-COLLECTION-000-003-111-985,oai:nsdl.org:2200/20120110191023721T,NSDL,crinoids; corals; brachiopods; bryozoans; other limestones; outcrop; this group of limestone beds commonly contains trilobites of the species Phacops rana; Why did they roll up?; look at the "sowbug" or "pillbug" (Armadillidium) that you might find under a rotting log; These flexible arthropods can roll up into a tight ball to protect their soft underside; Although not closely related these modern land arthropods have a similar body design to the ancient sea-dwelling trilobites; Perhaps rolled up to defend themselves from predators and strong storm agitation

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      English

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