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The mid-Ordovician observed the very first cephalopods with septa strong plenty of to cope Using the pressures affiliated with deeper water, and will inhabit depths greater than a hundred200 m.[139] The path of shell coiling would verify being essential to the longer term good results of the lineages; endogastric coiling would only permit large measurement to Squid be attained by using a straight shell, whereas exogastric coiling to begin with rather