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::Nope, it is just the definition of modern arthropods. It is entirely possible that the ancestor of the trilobite had a much softer exoskeleton, limiting its ecological success. Whether or not it was an arthropod is literally a matter of semantics, not a matter of biology.[[User:FCapra|FCapra]] 18:19, 22 September 2011 (EDT)
 
::Nope, it is just the definition of modern arthropods. It is entirely possible that the ancestor of the trilobite had a much softer exoskeleton, limiting its ecological success. Whether or not it was an arthropod is literally a matter of semantics, not a matter of biology.[[User:FCapra|FCapra]] 18:19, 22 September 2011 (EDT)
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::::Proto-arthropods do exist.  They're called "lobopods".  They are reasonably well-documented in the fossil record and can still be found today if you know how to look (e.g. digging through sponges with dissecting probes). --[[User:JHunter|JHunter]] 12:47, 21 January 2012 (EST)
    
== Chimpanzees and Gorillas ==
 
== Chimpanzees and Gorillas ==
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