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Re: Ichthyovenator, new spinosaurid from Early Cretaceous of Laos
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- Subject: Re: Ichthyovenator, new spinosaurid from Early Cretaceous of Laos
- From: Tim Williams <firstname.lastname@example.org>
- Date: Mon, 23 Apr 2012 13:30:15 +1000
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Robert Schenck <firstname.lastname@example.org> wrote:
> Since Allain is involved in this, presumably there will be some
> isotopic analysis to follow, he's done a lot of good work on that.
> IIRC Allain was the one to demonstrate isotopically that Spinosaurids
> were fish-eaters.
Amiot &c used teeth for their isotopic studies on theropods and
crocodilians. No teeth are known for _Ichthyovenator_.
BTW, the name "fish hunter" was based on the inferred piscivorous
habits of Spinosauridae in general. It is unknown whether
_Ichthyovenator_ has the craniodental specializations associated with
piscivory seen in other spinosaurids. Allain &c regard
_Chilantaisaurus_ as a spinosaurid. A theropod tooth referred by Hu
(1964) to _Chilantaisaurus_because it was associated with the holotype
is recurved, serrated and transversely compressed - atypical of
spinosaurids. So either this tooth does not belong to
_Chilantaisaurus_ (which Benson & Xu, 2008, rate as a good
possibility), or _Chilantaisaurus_ had teeth unlike those of (other)
spinosaurids. Either way, it cannot be assumed that all spinosaurids
had the characteristic piscivorous adaptations of the group. The fact
that Allain &c's analysis has _Ichthyovenator_ inside Baryonychinae
makes it more likely; but the "fish hunter" habits inferred for
_Ichthyovenator_ are not based directly on the fossil itself.
Theropod teeth have been found associated with the sauropod
_Tangvayosaurus_, also from the Grès supérieurs Formation of Laos.
> How come email@example.com isn't pre-set as the automatic,
> pre-populated ' reply-to ' address for the list? Other lists can do
> this no? I figure this must've come up before in the long history of
> the list and was curious.
I don't know the answer, but I can say that it's perhaps a good idea
that firstname.lastname@example.org isn't set as the default. There is less chance
that off-list replies intended for individuals are not sent
inadvertently to the whole list.