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The mid-Ordovician saw the 1st cephalopods with septa sturdy adequate to manage Along with the pressures connected with further drinking water, and could inhabit depths larger than 100200 m.[139] The way of shell coiling would demonstrate to 메이저사이트 be important to the future results in the lineages; endogastric coiling would only allow huge size to get attained with a straight shell, While exogastric coiling initially relatively