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Re: Haplocheirus and Gregory S. Paul
Mark Pauline <email@example.com> wrote:
> The analyses of Haplocheirus that
> I've read focus on dispelling any vestiges of the "temporal
> paradox". It occurred to me, though, that this animal also
> has strong implications for Birds Come First or modified BCF
> hypotheses (like Gliding Paravians Come First).
BCF died a long time ago. Darren Naish pronounced the last rites in his
brilliant Tet Zoo blog, where he explicitly refuted BCF. Though by this time
it was obvious that BCF was unsupportable (and always had been). When
discoveries such as _Haplocheirus_ turn up, all that's left to do is grab a
stick and prod the BCF corpse one more time.
Also, as I'm sure you're aware, GSP's hypothesis is much more conservative than
BCF. The latter was conceived by somebody else, and is far more radical in
proposing that ALL dinosaurs (even sauropods and ornithischians) evolved from
ancestors that were arboreal and (in the case of theropods) glissant as well.
> The basalmost Therizinosauroid,
> Falcarius, and the basalmost Oviraptorosaurid,
> Incisivosaurus, also seem to be primitively big and non -
> aerodynamic. This suggests that the most primitive
> maniraptorans that could glide or fly were paravians, and we
> have basal members of each of the three main paravian
> lineages to prove that they did, all from the Jurassic or
> Early Cretaceous.
I'd agee with you up to the point about oviraptorosaurs. _Protarchaeopteryx_
is only about 1m long (including the fairly long tail), and the skull of
_Incisivosaurus_ is about ~10cm long. So I wouldn't call these basal
oviraptorosaurs especially large. If an Oviraptorosauria-Paraves clade is
supported (to the exclusion of alvarezsaurs and therizinosaurs), I'm open to
glissant/scansorial behavior being primitive for this clade.