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The mid-Ordovician saw the initial cephalopods with septa powerful more than enough to manage Using the pressures affiliated with deeper water, and will inhabit depths greater than one hundred200 m.[139] The path of shell coiling would establish for being crucial to the long run achievement with the 메이저사이트 lineages; endogastric coiling would only permit substantial dimension being attained having a straight shell, Whilst exogastric coiling initially somewhat