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The mid-Ordovician observed the initial cephalopods with septa robust sufficient to cope While using the pressures connected to deeper water, and will inhabit depths better than 100200 m.[139] The course of shell coiling would confirm to become crucial to the long run good results of the lineages; endogastric coiling would only allow big sizing here to get attained having a straight shell, Whilst exogastric coiling originally rather