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Re: Spinosaurus Question
Christopher Taylor wrote:
Has anyone ever designated a lectotype from among the _Spinosaurus_
material (assuming that all the original material had equal type
AFAIK, no lectotype has been designated for _Spinosaurus_. As I understand
it, the situation is complicated by the fact that the type material no
longer exists, and there's no incontrovertible referred material to erect a
neotype for _Spinosaurus_.
In the event of the _Spinosaurus_ hypodigm containing
material from multiple species, does the name stay with the dorsal
spines, or is this potentially an _Altispinax_/_Vulcanodon_-type
situation where the name is based on a feature not demonstrable in
the actual type material?
Yeah, good point. I've asked the same question.
To recapitulate what Rauhut said:
(1) The _Spinosaurus_ dorsals are lacking the strong pneumatization and
extra laminae of _Baryonyx_/_Suchomimus_, and are more similar to the
dorsals of allosauroids.
(2) The cervical assigned to _Spinosaurus_ is morphologically too different
from the dorsals to belong to the same theropod taxon.
(3) The proximal caudal assigned to _Spinosaurus_ is too large to belong to
the same individual as the dorsals, and its morphology suggests that it may
actually be from an ornithischian.
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