Farewell to Species - reticulation

[Curtis Clark]

At 11:24 PM 00.02.01 +0100, Hubert Turner wrote:
>Because permanent splits are the only things recognized by a
>cladistic analysis,  in the ideal case (i.e. when no homoplasies
>occur to muddle the outcome of the analysis) the cladogram would
>be:
>
>A   B  C  Z     D
> \   \/   |    /
>  \   \   |   /
>   \   \  |  /
>    \   \ | /
>     \   \|/
>      \   /
>       \ /
>        /
>       /
>
>because apomorphies cannot be shared by common descent by only Z
>and D, or by only (B, C) and Z, or by only (B, C) and D. The whole

In real life, this doesn't often happen. Hybrid species or lineages often
get (or keep) more apomorphies from one parent than the other, so that they
resolutely cluster with one parent's clade.


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Curtis Clark                  http://www.csupomona.edu/~jcclark/
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