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The mid-Ordovician observed the primary cephalopods with septa sturdy ample to cope Using the pressures associated with further drinking water, and could inhabit depths larger than one hundred200 m.[139] The direction of shell coiling would verify to get vital to the future results in the lineages; endogastric coiling would only permit substantial dimension to generally be attained by using a straight shell, whereas exogastric coiling to 메이저사이트 begin with fairly