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The mid-Ordovician saw the 1st cephalopods with septa sturdy sufficient to manage Along with the pressures connected with deeper drinking water, and could inhabit depths larger than 100200 m.[139] The 메이저사이트 way of shell coiling would confirm to be important to the future achievements in the lineages; endogastric coiling would only allow massive size to get attained with a straight shell, While exogastric coiling initially relatively