[Old Board Archive]: Fossils / evolution of cephs

Discussion in 'Cephalopod Fossils' started by tonmo, Apr 29, 2003.

  1. tonmo

    tonmo Titanites Staff Member Webmaster Moderator

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    Some of you may remember this classic thread from the "old" message board system (pre-November 2002). Enjoy!

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    Fossils / evolution of cephs|tonmo|
    I came across this article and it got me thinking -- are there any octopus fossils? I mean, they don't have skeletons, so what's the deal? And what do we know about their evolution?

    So I tried to research an answer and came up with the following bits of info:

    UH Publishes Breakthrough on Squid Evolution -- this is a really brief but interesting article from 2/15/02 that provides a synopsis of a study that was published that week. The study basically finds that squid have surprisingly few "Hox genes," which are apparently responsible for fundamental structure of a living body as the organism grows. It was once thought that complex animals (such as squid) would have many Hox
    genes, while simple creatures (such as sea anemones) would have few. So this study seems to pretty much throw that idea out the window. The article itself does a good job of explaining the findings; have a look.

    Octopus Fossil -- little tidbit about an octopus fossil being found from the Jurassic period, along with what seems to be an illustration of it?

    Just thought I'd share what I found... I see a lot out there about shelled cephalopods, but if anyone can point to any other info on squid/octopus evolution, I'd be interested! Thanks,


    Re: Fossils / evolution of cephs|steve_oshea|
    Howdo Tony; sorry, it's just another shelled octopus, but it is the only fossil octopus that I am aware of in New Zealand literature (I'd love someone to write something to the contrary, as this is an area I have sadly neglected in my studies and need to brush up on).

    At any rate, the shell belongs to the genus Izomonauta - very similar to Argonauta (the Paper Nautilus) described from the Kapitean (local) Stage (upper Miocene), 5.3+ million years ago.

    Ref: Marshall, B.A. 1971. Izomonauta (Argonautidae, Cephalopoda, Coleoida) from the Kapitean Stage (Uppermost Miocene) of New Zealand. New Zealand Journal of Geology and Geophysics 14: 288-292.

    I'm afraid there are no soft parts described for this record. That would really be a buzz.
    Cheers
    O


    Re: Fossils / evolution of cephs|pikaia|
    hello

    you know what in intresting book about the evolution of the ocean is. is the book Planet Ocean ( im sorry i forgot who wrote it) but it is the story of these two guys who go around looking for fosils and other stuff-they go on a tour of the Burgess shale place in the rocky mountains-very cool- it doesnt really have much to say about cephlopods there's not much in the fossil record about them but it does have some about amonites which is very interesting.

    there's also a lot of pictures by robert troll and there pretty cool.

    another book i would most definently recomend if you just want to learn about fossils and the evolution of the sea in general you Absolutly have to read Richard Eliss's Aquaevolution, i have yet to finish it but so far it's really good .:)


    Re: Fossils / evolution of cephs|pikaia|
    Hello again
    well it seems i got confused and told you the wrong book title, what i ment to say was the book by Richard Ellis is called aquagenisis. Thats all bye bye


    Re: Fossils / evolution of cephs|tonmo|
    This week I received an email from Tony Frazer regarding this thread, and I'm pasting it below with his permission. Thanks for this fascinating detail, Tony F.!

    -- tonmo
     

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