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Re: Reflections on Recent "Dromaeosaurs"
Jaime A. Headden wrote:
*Achillobator* [could be] an assemblage of more than one taxa (as
suggested by Burnham et al., 2000) a dromie, and
another maniraptoriform, or more.
I just looked at the _Bambiraptor_ paper and, yeah, the authors raise this
as a possibility. I'm willing to believe that _Achillobator_ is a good
taxon, just one that doesn't happen to fit neatly into existing cladograms.
Burnham also suggest that _Utahraptor_ is a chimera too, based as it is on
scattered bones: "We see little reason to believe that these bones come from
a single species, let alone a dromaeosaurid )p.7)."
may be a distinct taxon from *Saurornitholestes*. This
is the bulk of Burnham et al.'s differentiation, so
I'm not too willing to trust it, but it seems a
likelyhood. At worst, Bambi is a unique "species," if
not a genus.
So your cladogram below should probably have _Bambiraptor_ and
_Saurornitholestes_ grouping a lot closer together. Although the
_Saurornitholestes_ type material is fragmentary and not a lot can be
gleaned from it, there is some good stuff for this genus yet to be
As for _Adasaurus_, the obturator process is about half way down the the
ischial shaft, so more distally located compared to other dromaeosaurids
(except _Achillobator_). This specimen apparently comes from a "pathologic
individual" (says Norell and Makovicky), but I don't know why.
`--+--*Utahraptor ostrommaysi /
`--+--+--*Bambiraptor feinbergi /
| |--*Adasaurus mongoliensis*
| `--+--*Unenlagia comahuensis*
| `--+--*Rahonavis ostromi*
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