The mid-Ordovician noticed the initial cephalopods with septa robust adequate to cope While using the pressures affiliated with deeper water, and will inhabit depths increased than 100200 m.[139] more The way of shell coiling would establish 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 coiling originally instead
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