The mid-Ordovician observed the 1st cephalopods with septa solid plenty of to cope Using the pressures associated with further drinking water, and could inhabit depths larger than one hundred200 m.[139] The direction of shell coiling would verify being vital 안전놀이터 to the future results in the lineages; endogastric coiling would only permit massive dimension to generally be attained by using a straight shell, whereas exogastric coiling to begin with fairly