||[Jul. 24th, 2009|10:57 pm]
The Internet Pterosaur Fanciers Society
|||||Lou Reed: Street Hassle||]|
Oh, but it's ben quiet here! I am determined to make more of an effort...
Here's a thing that has been bothering me, and I would really appreciate any input on this.
As I think I've mentioned here before, I've only ever been able to find two really good, authoritative textbooks on the subject; Wellnhofer's "Illustrated Encyclopedia of Pterosaurs and Unwin's "The Pterosaurs from Deep Time". I was reading both recently and found a major point of disagreement. Wellnhofer says that pterosaurs had a keel or carina on the sternum for attatchment of the flight muscles, just as birds do. Yet Unwin, writing much later (about 2005) states categorically that no pterosaur has EVER been found with a carina. He describes the sternum as flat or "dished" and discusses the possibility of a keel made of cartilage, which he considers unlikely as even this would have left traces of an attatchment site on the bone.
You'd expect books written at different times to disagree on some points, but this one is hard to reconcile. I've been looking all over the net, and there seems to be general agreement that pterosaurs DID have a carina, so why on earth was Unwin claiming just a couple of years ago that they did not? He clearly knows his stuff, and must have had a reason. I just don't get it... Heeeeelp!