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The mid-Ordovician saw the initial cephalopods with septa robust enough to manage With all the pressures associated with further water, and will inhabit depths higher than a hundred200 m.[139] The path of shell coiling would verify to get crucial to the long run achievement with the lineages; endogastric coiling would only permit substantial dimension 메이저사이트 being attained having a straight shell, Whilst exogastric coiling at first somewhat