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The mid-Ordovician observed the very first cephalopods with septa strong plenty of to cope with the pressures connected to deeper h2o, and could inhabit depths bigger than one hundred200 m.[139] The direction of 메이저사이트 shell coiling would confirm for being very important to the long run success on the lineages; endogastric coiling would only permit massive size to get attained with a straight shell, While exogastric coiling initially relatively

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