Taxonomic Status

["Ivan Kwan" <t_rexkwan@hotmail.com>]

Just wondering:

Is Chasmosaurus irvinensis (looks quite nice, but WHERE ARE THE BROW 
HORNS??) recognised as a valid species? What features are there to prevent 
it from being recognised as being an atypical C. belli or C. russeli?

Is Chasmosaurus canadensis still recognised or has it been officially 
synonymised with C. belli?

Just what is Antarctosaurus? Is it a titanosaur, or is it (as i read 
somewhere else) a diplodocimorph?

By the way, did Titanosaur heads vary that much? I know that sauropod skulls 
are exceedingly rare, but I have seen many restorations of them with 
squarish, camarasaur-like heads, while the recent finds of Rapetosaurus and 
Nemegtosaurus seem to show otherwise. What is the consensus, folks? Did some 
titanosaur families have square heads while others had slender skulls? Or 
did all of them convergently evolve a nice diplodocid-like head?

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