homology in biogeography and biology

John Grehan jrg13 at PSU.EDU
Wed Sep 22 21:24:33 CDT 1999

>Please note: it is not simply "similarity of features" (or as Richard
>Jensen wrote: "a similarity reflecting common origin"), it is
>similarity of features *as a result of common ancestry*.

Agreed. this was implicit.

>But this seems to leave out the notion of descent from a common
>ancestor, which is at the heart of our understanding of homology, and
>has been for a very long time.

Again, this was implicit. Sorry I should been explicit.

 Homology has a
>much more restrictive meaning than just similarity.

Agreed. In panbiogeography the homology is a common history or origin

John Grehan

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