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Re: Spinosaurus

At 03:04 PM 11/27/96 +1030, Dinogeorge wrote:
>There are quite a few differences between _Spinosaurus_ and _Becklespinax_ in
>papers). In _Spinosaurus_ many of the dorsal vertebrae--particularly toward
>the front end of the animal (cranial dorsals)--articulate like ball and
>socket joints (opisthocoely), indicating a certain amount of mobility: the

        If I recall correctly, opisthocoelous dorsals are currently
interpreted as a size-related feature and are found in several
non-sail-backed large theropods.  This does not, however, eliminate the
George's theory.

>muscular flesh. So it's likely that _Becklespinax_ sported a ridgeback,
>whereas _Spinosaurus_ had some kind of sail.

        I have been wondering if we may be overstating the possible
differences between _Metriacanthosaurus_ and _Becklespinax_.  Can anyone out
there sumarize the points that are made against a close relationship?

| Jonathan R. Wagner                    "You can clade if you want to,     |
| Department of Geosciences              You can leave your friends behind |
| Texas Tech University                  Because your friends don't clade  |
| Lubbock, TX 79409                               and if they don't clade, |
|       *** wagner@ttu.edu ***           Then they're no friends of mine." |
|           Web Page:  http://faraday.clas.virginia.edu/~jrw6f             |