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The mid-Ordovician saw the initial cephalopods with septa robust enough to manage Together with the pressures connected with further drinking water, and will inhabit depths increased than 100200 m.[139] The course of shell coiling would demonstrate to be important to the future results in the lineages; endogastric coiling would only allow huge sizing for 안전놀이터 being attained with a straight shell, While exogastric coiling in the beginning fairly