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Thread: A Biological Question on Octopuses

  1. #1 A Biological Question on Octopuses 
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    If Octopi have no skeletol structures, how then do they have solid beaks?

    I know the sea is rich in calcium, thus is there some logical reasoning behind this?

    Thanks¬


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    Forum Cosmic Wizard i_feel_tiredsleepy's Avatar
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    I don't see how it's connected, they don't have to have a skeleton to have hard parts.

    I don't believe the beak is made of a similar material so it likely evolved separately from the skeletal structures that cephalopods have lost.


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  4. #3 Re: A Biological Question on Octopuses 
    Universal Mind John Galt's Avatar
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    Quote Originally Posted by Manynames
    If Octopi have no skeletol structures, how then do they have solid beaks?

    I know the sea is rich in calcium, thus is there some logical reasoning behind this?

    Thanks¬
    I am not quite sure why you think the absence of a skeletal structure should prevent the presence of a beak. Octopi are cephalopods and their cousins the lamellibranchs (such as clams) and gastropods (such as snails) have hard external skeletons while squid have an internal skeleton.

    Moreover, the beak is not made of calcium carbonate, but a mixture of chitin (a glucose derived polymer), protein and water. There is much more information on it here.
    http://scienceblogs.com/notrocketsci...ngineering.php

    As to a 'logical reason' for the beak, it evolved. Without it the octopus would have to engage in a completely different lifestyle.
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    Quote Originally Posted by i_feel_tiredsleepy
    I don't see how it's connected, they don't have to have a skeleton to have hard parts.

    I don't believe the beak is made of a similar material so it likely evolved separately from the skeletal structures that cephalopods have lost.
    I asked because i was under the impression the beak was a type of structure made from similar componants of bone, such as calcium... am i wrong?
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  6. #5  
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    I know that nails contain no calcium. Is this the same reasoning?
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  7. #6  
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    Quote Originally Posted by Manynames
    Quote Originally Posted by i_feel_tiredsleepy
    I don't see how it's connected, they don't have to have a skeleton to have hard parts.

    I don't believe the beak is made of a similar material so it likely evolved separately from the skeletal structures that cephalopods have lost.
    I asked because i was under the impression the beak was a type of structure made from similar componants of bone, such as calcium... am i wrong?
    (sorry, my eyes missed the link)
    Only the mind can think twice simultaneously about a subject, but only one thing can inexorably come out of it. A choice.
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  8. #7 Re: A Biological Question on Octopuses 
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    Quote Originally Posted by John Galt
    Quote Originally Posted by Manynames
    If Octopi have no skeletol structures, how then do they have solid beaks?

    I know the sea is rich in calcium, thus is there some logical reasoning behind this?

    Thanks¬
    I am not quite sure why you think the absence of a skeletal structure should prevent the presence of a beak. Octopi are cephalopods and their cousins the lamellibranchs (such as clams) and gastropods (such as snails) have hard external skeletons while squid have an internal skeleton.

    Moreover, the beak is not made of calcium carbonate, but a mixture of chitin (a glucose derived polymer), protein and water. There is much more information on it here.
    http://scienceblogs.com/notrocketsci...ngineering.php

    As to a 'logical reason' for the beak, it evolved. Without it the octopus would have to engage in a completely different lifestyle.
    The link is very interesting, and answers all my questions. Cheers
    Only the mind can think twice simultaneously about a subject, but only one thing can inexorably come out of it. A choice.
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