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The mid-Ordovician observed the initial cephalopods with septa powerful more than enough to manage With all the pressures associated with further water, and will inhabit depths higher than a hundred200 m.[139] The route of shell coiling would prove being vital to the longer term accomplishment of the lineages; endogastric coiling would only allow big dimensions to become attained which has a straight 안전놀이터 shell, whereas exogastric coiling in the beginning fairly