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The mid-Ordovician saw the very first cephalopods with septa robust adequate to cope Using the pressures associated with further drinking water, and could inhabit depths larger than one hundred200 m.[139] The 메이저사이트 direction of shell coiling would verify being vital to the longer term results in the lineages; endogastric coiling would only allow substantial dimension to be attained that has a straight shell, whereas exogastric coiling in the beginning fairly