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Re: Cranial crests in pterosaurs
>From what I've seen, and I'm sure you are well aware of soft tissue
extensions present on many crested pterosaurs (Tapejara, Germanodactylus,
Gnathosaurus) and that soft tissue extensions are possible on others
(Tupuxuara, Dsungaripterus) due to similar structures at the bases of these
hypothetical crests and courtesy of cladistics. The extent of the crests as
shown in Figure 10 is purely hypothetical in most cases but worthy of
further study. Perhaps a useful cautionary tale for future workers not to
destroy any funny-looking matrix north of the skull until the absence of a
crest is assured.
Hebert Bruno Campos wrote:
> In Figure 10, Frey et al., (2003) illustrated a reconstruction of the
> cranial crests with soft parts of pterosaurs Pterodactylus sp.,
> Huanhepterus quinyangensis, Germanodactylus cristatus, Germanodactylus
> rhamphastinus, Phobetopter parvus, Dsungaripterus weii, Tapejara
> imperator, Tapejara wellnhoferi, Tupuxuara longicristatus and
> Gnathosaurus subulatus. They still divided these pterosaur skulls in
> five basic parts: soft-tissue crista, fibrous crista, rhamphotheca,
> occipital cone and bone.
> They reconstructed the cranial crest of these pterosaurs with support on
> the new Pterodactylus specimen (JME SOS 4784) with a preserved fibrous
> cone and others soft-tissues.
> Is the fibrous occipital cone an not mineralized occipital spine (=
> parietal crest)? This soft-tissue crests reconstructions be correct?
> Frey, E.; Tischilinger, H.; Buchy, M.-C. & Martill, D.M., 2003. New
> specimens of Pterosauria (Reptilia) with soft partes with implications
> for pterosaurian anatomy and locomotion. In: Buffetaut, E. & Mazin,
> J.-M. (Eds.) Evolution and Palaeobiology of Pterosaurs. Geological
> Society, London, Special Publications, 217, 233-266.
> David Peters wrote:
> >How were you surprised? That will give us a starting point.
> >David Peters
> >St. Louis