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The mid-Ordovician noticed the very first cephalopods with septa powerful enough to manage Along with the pressures linked to deeper h2o, and will inhabit depths higher than a hundred200 m.[139] The course of shell coiling would demonstrate to become very important to the long run achievement of your lineages; endogastric coiling would only allow big here sizing to get attained with a straight shell, Whilst exogastric coiling at first alternatively