The mid-Ordovician saw the main cephalopods with septa strong enough to manage Along with the pressures linked to deeper h2o, and could inhabit depths higher than a hundred200 m.[139] The route of shell coiling would show to be important to the long run success with the ???? lineages; endogastric coiling would only permit large dimensions to becom

two hundred m.[139] The route of shell coiling would show to be important to the long run success with the lineages; endogastric coiling would only permit large dimensions to become attained which has a straight Squid shell, While exogastric coiling initially somewhat