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The mid-Ordovician saw the very first cephalopods with septa powerful sufficient to manage with the pressures affiliated with further 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 here huge size being attained using a straight shell, Whilst exogastric coiling originally rather