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The mid-Ordovician saw the main cephalopods with septa potent more than enough to manage Together with the pressures connected with deeper h2o, and could inhabit depths greater than a hundred200 m.[139] The route of shell coiling would show to be important to the long run success with the lineages; endogastric coiling would only permit large dimensions Squid for being attained with a straight shell, Whilst exogastric coiling at first alternatively