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The mid-Ordovician noticed 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 direction of shell coiling would establish to get vital to the longer term results in the lineages; endogastric coiling would only allow massive dimension to be attained that has a 메이저사이트 straight shell, whereas exogastric coiling in the beginning relatively