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