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Completely enrolled specimen of the olenellid Mummaspis muralensis from the early Cambrian Mural Formation (Jasper National Park, Alberta). This represents the oldest direct evidence of enrolment in the fossil record of polymerid trilobites

Early rollers: scientists pinpoint very first ‘enrolling’ animal

25 Sep 2013

New fossil find reveals that trilobites were able to roll themselves up defensively far earlier than was originally thought

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