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

Re: New theropod (or is it?) from Poland

----- Original Message -----
From: "Dawid Mazurek" <dawidmazurek@wp.pl>
Sent: Tuesday, August 12, 2008 9:28 PM

Oh, the museum actually is in Lisowice! The brick pit is in Lipie ÅlÄskie


Apologies, BTW, for butchering the spelling that badly. I knew there's no n in it, and I knew there's an e at the end, and I even knew why! Must have been the time pressure; I left for Serbia the same day, to see most of that branch of the family for the first time... I came back this morning.

>Both features occur throughout rauisuchians and never in theropods.

Isn't "rauisuchian" just a term for a grade? They don't have any
autapomorphies, don't they?

The last few phylogenetic analyses have indeed found them to be paraphyletic. But none of them are reasonably large, as far as I know, and most date to 1994 and before. (The *Qianosuchus* paper from 2006 finds a big polytomy...) The main reason, as lamented in the description of *Postosuchus alisonae* (JVP June 2008), is that detailed descriptions don't exist for most "rauisuchian" species. I simply tried to cut this long story short.

Given the unique gait (vertical femur with dorsally-pointing head and ventrally-pointing acetabulum -- seen very nicely in the *Lotosaurus* exhibited in Beijing) that is said to characterize all rauisuchians plus aetosaurs, I wouldn't be surprised if they turned out to be monophyletic. But I have no idea how widespread it really is, how many grades of it exist, and so on. I'm not among the very few experts on those animals.