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Thread: Endoskeleton and an exoskeleton both - possible?

  1. #1 Endoskeleton and an exoskeleton both - possible? 
    Forum Ph.D. Raziell's Avatar
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    Are there any lifeforms on earth wich has both? If not is it even possible to happen in evolution, under the right circumstances? What would be the pros and cons of such a creature?


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  3. #2  
    Time Lord
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    Armadillos. I think their plates are something like fingernail, and being fused to the skin and large obviously help support soft tissue as in exoskeleton. I wonder about armadillo muscles?

    Turtles, sort of.


    A pong by any other name is still a pong. -williampinn
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    WYSIWYG Moderator marnixR's Avatar
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    ankylosaurs

    nothing in principle prevents an organism to have both an endoskeleton and an exoskeleton - however, it's quite an extra bit of investment + it's likely to slow you down
    "Reality is that which, when you stop believing in it, doesn't go away." (Philip K. Dick)
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  5. #4  
    Forum Cosmic Wizard spuriousmonkey's Avatar
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    Placodermi.
    "Kill them all and let God sort them out."

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  6. #5  
    Forum Ph.D. Raziell's Avatar
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    So the creatures that DO have both are few or extinct? I thought it would have alot more of an advantage then a burden but guess im wrong :?
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    Forum Cosmic Wizard spuriousmonkey's Avatar
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    That's unscientific reasoning.

    Most hominins are extinct as well.
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  8. #7  
    WYSIWYG Moderator marnixR's Avatar
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    Quote Originally Posted by spuriousmonkey
    Most hominins are extinct as well.
    reminds me of the Far Side joke of the crocodile reminiscing about a human he'd eaten : nice and juicy on the outside, with a lovely crunch on the inside
    "Reality is that which, when you stop believing in it, doesn't go away." (Philip K. Dick)
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  9. #8  
    Forum Cosmic Wizard paralith's Avatar
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    Quote Originally Posted by Raziell
    So the creatures that DO have both are few or extinct? I thought it would have alot more of an advantage then a burden but guess im wrong :?
    If you already have an endoskeleton for support, then the purpose of the exoskeleton is for protection. In order for it to work well as protection, it needs to be thick and/or hard, and in order for it to be like this, an animal has to invest a lot of energy in growing this exoskeleton. Energy that could otherwise be spent on reproduction. Basically, there is a high cost to growing and exoskeleton, so the benefits better be very high as well. You better be able to significantly increase your survival rate. So if you're a fast animal like a deer or an animal that can fly like a bird, why waste your time on an outer shell when you already have a good means of escaping danger?
    Man can will nothing unless he has first understood that he must count on no one but himself; that he is alone, abandoned on earth in the midst of his infinite responsibilities, without help, with no other aim than the one he sets himself, with no other destiny than the one he forges for himself on this earth.
    ~Jean-Paul Sartre
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  10. #9  
    Time Lord
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    Quote Originally Posted by Raziell
    more of an advantage then a burden :?
    The main advantages of either, are soft tissue support; and anchorage for muscles. So having both skeletons is redundant. I don't know but I'm guessing the armadillo has stronger endoskeleton and depending muscles to support the exoskeleton, so is actually evolving away from using it efficiently.
    A pong by any other name is still a pong. -williampinn
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