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See question title. After doing some looking around on my own I haven't found much so I figured I'd ask some experts.

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closed as too broad by J. Musser, The Last Word, MattDMo, WYSIWYG, Chris Jun 22 at 9:09

There are either too many possible answers, or good answers would be too long for this format. Please add details to narrow the answer set or to isolate an issue that can be answered in a few paragraphs.If this question can be reworded to fit the rules in the help center, please edit the question.

    
What kind of skeleton? –  J. Musser Jun 21 at 23:33
    
what he's asking is if you are talking about bones or including chitin (insects and things like crabs and shrimps) or other exoskeletal structures? –  shigeta Jun 22 at 0:19
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Shall we include the cytoskeleton? –  canadianer Jun 22 at 18:34
    
further information en.wikipedia.org/wiki/Smallest_organisms –  The Last Word Jun 23 at 4:34

1 Answer 1

The smallest vertebrate (if that's what you mean; there are many invertebrates with endoskeletons that are not made of bone) is Paedophryne amanuensis, a Papua New Guinea frog that's about 7 mm long.

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do you have a reference for this? –  MattDMo Jun 22 at 4:59
    
    
interesting, thanks! –  MattDMo Jun 22 at 18:09

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