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The mid-Ordovician observed the primary cephalopods with septa robust enough to manage Together with the pressures related to further drinking water, and will inhabit depths increased than 100200 m.[139] 메이저사이트 The course of shell coiling would demonstrate to generally be critical to the future results in the lineages; endogastric coiling would only allow huge sizing to get attained with a straight shell, While exogastric coiling initially relatively