The mid-Ordovician observed the 1st cephalopods with septa solid plenty of to cope With all the pressures related to further drinking water, and could inhabit depths bigger than one hundred200 m.[139] The path of shell coiling would prove to generally be important to the future success with the lineages; endogastric coiling Squid would only permit significant dimensions for being attained with a straight shell, While exogastric coiling at first alternatively