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The mid-Ordovician saw the primary cephalopods with septa robust sufficient to manage Along with the pressures connected with further drinking water, and could inhabit depths increased than 100200 m.[139] The course of shell coiling would demonstrate to be critical to the future results in the lineages; endogastric coiling would only allow huge sizing for 먹튀사이트 being attained which has a straight shell, While exogastric coiling in the beginning relatively