The mid-Ordovician saw the main cephalopods with septa strong more than enough to manage Along with the pressures linked to deeper h2o, and could inhabit depths higher than a hundred200 m.[139] The course of shell coiling would demonstrate to become very important to the here long run achievement of the lineages; endogastric coiling would only allow big sizing to get attained having a straight shell, Whilst exogastric coiling originally rather
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