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The mid-Ordovician noticed the 1st cephalopods with septa solid 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 be important to the future achievements in the lineages; endogastric coiling would only allow huge size to get attained with a straight 메이저사이트 shell, While exogastric coiling initially somewhat