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The mid-Ordovician saw the 1st cephalopods with septa solid plenty of to cope With all the pressures related to further drinking water, and could inhabit depths bigger than one hundred200 m.[139] The path of shell coiling would verify being vital to the future results in 메이저사이트 the lineages; endogastric coiling would only permit substantial dimension to generally be attained that has a straight shell, whereas exogastric coiling in the beginning fairly