[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
RE: Suchosaurus, Baryonyx and Martinavis
Guy Leahy wrote:
> If _Spinosaurus_ is a chimera, where would that place
> the dorsal vertebrae?
Possibly an allosauroid, close to _Acrocanthosaurus_.
> Are there any features of the
> vertebrae which unite the specimen with _Suchomimus_?
> Dr. Sereno's original description of _Suchomimus_
> doesn't mention any:
> An update on the original _Spinosaurus_ material
> doesn't touch on this issue either:
Regarding the possibly chimeric nature of the _Spinosaurus aegyptiacus_ type
material, my solitary source for this is Rauhut. The cranial material strongly
suggests affinities to _Baryonyx_/_Suchomimus_, but the postcranium (says
Rauhut) does not. The distinctive tall-spined dorsals are quite different to
those of _Baryonyx_/_Suchomimus_: they lack the strong pneumatization and
additional laminae of baryonychine dorsals, and are more similar to the dorsals
of allosauroids. Also, the known cervical of _S. aegyptiacus_ is said by
Rauhut to be too morphologically distinct from the _S. aegyptiacus_ dorsals to
be referrable to the same theropod taxon. Finally, the proximal caudal
assigned to _S. aegyptiacus_ is said to be too big to belong to the same
individual as the dorsals - and the morphology even suggests that the caudal
may be ornithischian! Nevertheless, the snout and dorsals all come from a huge
theropod, which helps bolster the case that these (at least) come from a single
BTW, this "chimeric _Spinosaurus_" idea has received very little attention, and
even less support (to date). I don't know enough to comment either way. It
may pan out (which would lead to all sorts of trouble - what element gets
custody of the name?); or it may not. It's a shame all the material was blown
Rauhut, O. W. M. (2003). The interrelationships and evolution of basal theropod
dinosaurs. Special Papers in Palaeontology 69: 1-213.
Help yourself to FREE treats served up daily at the Messenger Café. Stop by