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Re: PDF-request: Original description of Lagosuchus and/or Marasuchus
This is a much different definition of Autapomorphy than I am used
to, which is a character state that is unique to a terminal taxon and
thus uninformative in a phylogentic analysis. I believe this is the
definition that David Peter's is also following when it describes
them as "weird".
I would think that the term apomorphy is what you described above.
I'm using Hennig's definitions, under which one taxon (no matter how
big) has autapomorphies and two sister-groups have synapomorphies; those
synapomorphies are autapomorphies of the smallest clade that contains
the two sister-groups. So, fused frontals are an autapomorphy of
Pachypleurosauridae, Carcharodontosauridae, and Anthropoidea _each_.
Hennig was one of those people who like to make up terminology for the
fun of it, but this way the meanings of these terms don't depend on the
taxon sample of a data matrix. If you want to say a character state is
unique, just do that.