Steve, I know this is not my section so I hope you don't mind me posting this, but I could not resist!Steve O'Shea said:There is an octopus with a 'swim bladder' - a very bizarre arrangement. It is found in the female of Ocythoe tuberculata, but I'm not sure if the male also possesses this structure (the female is considerably larger than the male);
Hope you don't mind me risking sidetracking this interesting discussion about Lepidoteuthis, but I once saw a fascinating TV documentary that demonstrated your point, John. I am not exactly sure how it was done but a certain section of DNA coding was chemically 'switched off' somehow in an embryonic chick. The section that was turned off controlled the formation of the beak. When the chick was X-rayed a few days later it seems that instead of a beak fully forming, rudimentary teeth began to develop along the jaw. The idea here was to demonstrate the dinosaur/bird link and that 'fallback' structures are indeed encoded in DNA. Atavism indeed!Fujisawas Sake said:See, I think that there is a possibility, however remote, that ancestral traits "lost" along the evolutionary path are still encoded in DNA. albeit sleeping between relatively recent STOP and START codons.