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The mid-Ordovician saw the first cephalopods with septa powerful enough to manage While using the pressures connected to deeper water, and will inhabit depths better than 100200 m.[139] The course of shell coiling would confirm for being crucial to the longer term good results of the lineages; endogastric coiling would only allow huge size being attained having a straight shell, Whilst exogastric more coiling originally rather