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Re: Torvosaurus & Giganotosaurus
There may be a clade of basal tetanurines united by very short
but very stocky forearm (antebrachial) elements, and perhaps certain
other characters (such as of the vertebrae). This group would
include _Torvosaurus_, _Eustreptospondylus_, _Xuanhanosaurus_, and
_Marshosaurus_ (based on a preliminary description of this
genus presented at a fairly recent SVP meeting). These are burly,
robust theropods with powerful shoulder girdles - but both these
characters may be primitive for the Tetanurae.
This clade could be called Megalosauridae, because many researchers
have identified a close relationship between _Megalosaurus_ and
_Torvosaurus_. Unfortunately, _Megalosaurus_' postcranium is not
well-known. This may be one of the reasons why this family of
big, stocky-armed, primitive tetanurines has been called the
Torvosauridae by some.
I believe there is a redescription of the genus _Megalosaurus_ in the
works across the Atlantic. Maybe this will help clarify things.