[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]

Re: Bahariasaurus

The basis for this theory was an illustration I saw some time ago on the internet that depicted the pelvis of Bahariasaurus. I noticed it seemed to remind me a lot of Tyrannosaurus. I haven't been able to find it again though. I have heard some other claims of tyrannosaur affinities in the pelvis of Bahariasaurus. I also heard something about Dryptosaur/tyrannosauroid type material from somewhere in Cretaceous North Africa, including at least a forelimb and some metatarsals, but I am not sure what it was referred to (if anything). If anyone has an illustration of the Bahariasaurus type material, I would find it useful for examining this hypothesis. Now that I tought about it I have also heard about some teeth that supposedly belong to Bahariasaurus. Not sure of the basis for this though. If anyone knows more about this it may be helpful. Thanks for the info on the Indian teeth by the way. I have suspected that there may have been some variation in basal tyrannosaurid teeth, based in part upon the teeth of Aviatyrannus before a final design was developed in the ancestors of the more derived and Tyrannosaurinae. I suspected a relationship between Bahariasaurus and Dryptosaurus and/or Alectrosaurus based on the fact they seem to be primative tyrannosaurids or tyrannosaur relatives. As it stands I only have found good drawings of the type skeleton of Dryptosaurus and drawings that are of the Alectrosaurus skull and a supposed forelimb claw (which may not belong). As I think I stated before, I am a little short on good info on this topic. The reason I put it out there was to see what people with better information have to say about it.

From: "Mickey Mortimer" <Mickey_Mortimer111@msn.com>
Reply-To: Mickey_Mortimer111@msn.com
To: <dinosaur@usc.edu>
Subject: Re: Bahariasaurus
Date: Wed, 28 Apr 2004 02:51:10 -0700

B B wrote-

> If you feel it is an unsound argument feel free to pick it apart.  Here
> is my hypothesis:  I think Bahariasaurus was a basal tyrannosaur.  A
pelvis
> that supposedly belongs to it seems to indicate tyrannosaur affinities.

Why?  Which characters do the pelvic remains (pubis, proximal ischium) of
Bahariasaurus share with tyrannosauroids?

> Tyrannosaur premaxiliary teeth are known from India (they were previously
> reffered to Indosuchus).

What's the reference for this? Premaxillae referred to Indosuchus by
Chatterjee (1976) have been described as having D-shaped teeth. However,
these teeth are markedly asymmetrical, unlike tyrannosauroid premaxillary
teeth. They are also about as thick (labiolingually) as they are long
(mesiodistally), unlike tyrannosaurids (though teeth referred to
Aviatyrannis have subequal dimensions as well). Thus, these teeth fit the
much broader concept of "D-shaped" teeth that are found in most avetheropods
and apparently abelisaurids as well (Sampson et al., 1996). Indeed, the
Majungatholus premaxilla described by the latter authors is nearly identical
to that referred to Indosuchus, strongly suggesting the Indian remains are
abelisaurid.

> I suspect there may be a relationship between
> Bahariasaurus and Dryptosaurus and/or Alectrosaurus.

Again, you'll have to defend this with data.

Mickey Mortimer

_________________________________________________________________
Lose those love handles! MSN Fitness shows you two moves to slim your waist. http://fitness.msn.com/articles/feeds/article.aspx?dept=exercise&article=et_pv_030104_lovehandles