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The mid-Ordovician observed the 1st cephalopods with septa potent ample to cope While using the pressures linked to deeper h2o, and could inhabit depths larger than 100200 m.[139] The here way of shell coiling would demonstrate to be critical to the future results from the lineages; endogastric coiling would only allow big sizing for being attained which has a straight shell, whereas exogastric coiling in the beginning fairly