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The mid-Ordovician noticed the initial cephalopods with septa robust sufficient to cope While using the pressures connected to deeper water, and will inhabit depths increased than 100200 m.[139] The way of shell coiling would confirm for being essential to the longer term accomplishment from the lineages; endogastric coiling would only allow huge size being attained using a straight shell, Whilst exogastric more coiling originally instead