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Cladistic question (was synapomorphies)
David J. Froehlich writes;
>(I will use an example that has been used to
>ie bird/bat/pterosaur wings) we can hypothesize that wings are a shared
>derived feature for birds, bats and pterosaurs. When we run the analysis (=
>enough information) we will end up with a topology that does not unite thes=
>three taxa. Thus this is homoplasy not synapomorphy (but we could never
>this without the cladogram).
I'm not exactly clear, but surely there are other criteria on what animals=
to include in a cladistic analysis. I mean, one wouldn't try to build a=
cladigram that included _Camptosaurus_ and _Dienonychus_, since the two are=
clearly different from each other. How do cladists decide what animals to=
include in their studies? And wouldn't this add an element of opinion into=
the results, since the researcher would have to decide what animals to=
include in the study?