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The mid-Ordovician observed the 1st cephalopods with septa solid ample to cope Using the pressures associated with further drinking water, and could inhabit depths larger than one hundred200 m.[139] The direction 메이저사이트 of shell coiling would verify to get essential to the longer term results in the lineages; endogastric coiling would only allow massive dimension to generally be attained by using a straight shell, whereas exogastric coiling in the beginning fairly