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The mid-Ordovician observed the main cephalopods with septa strong more than enough to manage While using the pressures connected to deeper water, and will inhabit depths better than 100200 m.[139] The way of shell coiling would verify to be essential to the longer here term success of the lineages; endogastric coiling would only allow significant sizing to generally be attained which has a straight shell, Whilst exogastric coiling to begin with relatively