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The mid-Ordovician observed the primary cephalopods with septa sturdy adequate to cope with the pressures affiliated with further water, and will inhabit depths larger than one hundred200 m.[139] The direction of shell coiling would verify to get vital to the longer term results in the lineages; 메이저사이트 endogastric coiling would only allow massive dimension to generally be attained by using a straight shell, whereas exogastric coiling to begin with fairly