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The mid-Ordovician noticed the initial cephalopods with septa sturdy adequate to cope with the pressures affiliated 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 메이저사이트 dimension to be attained that has a straight shell, whereas exogastric coiling in the beginning relatively