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The mid-Ordovician observed the initial cephalopods with septa robust adequate to cope with the pressures affiliated with further water, and will inhabit depths better than 100200 m.[139] The way of shell coiling would confirm for being crucial to the longer term good results of the lineages; endogastric coiling would only allow big sizing to Squid get attained having a straight shell, Whilst exogastric coiling at first alternatively