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The mid-Ordovician observed 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 prove to generally be critical to the future achievements on the lineages; endogastric coiling would only 스포츠사이트 permit significant measurement to become attained which has a straight shell, While exogastric coiling initially somewhat