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RE: "Britain was dinosaur heaven 140m years ago"






> Hi All
>
> Gondwana seems to have missed out on all the exciting stuff. Here in Oz
> the dinos all seem a bit retro


:-)


I think part of the problem is that the "retro" nature of many Oz dinosaurs was 
based on erroneous conclusions about their affinities.  Many Oz dinosaurs from 
the Cretaceous were once fingered as "relict" or "primitive" members of their 
respective groups.

For example, the "primitive" Cretaceous sauropod _Austrosaurus_ was once 
thought to be a late-surviving 'cetiosaur'.  It's now been established quite 
convincingly that _Austrosaurus_ is a titanosauriform.  

The "_Allosaurus_" astragalus (NMV Pl50070), which was supposed to prove that 
_Allosaurus_ survived into the mid-Cretaceous of Australia, is probably not 
even from an allosaurid.  

_Rapator_ (another Cretaceous theropod) was initially linked to the Late 
Jurassic _Ornitholestes_ (hence the species name _ornitholestoides_); but the 
single bone probably comes from an alvarezsaurid.

Last but not least, some older phylogenies had _Minmi_ outside the 
ankylosaurid-nodosaurid clade, as some kind of basal ankylosaur.  More recent 
phylogenies have tended to nest _Minmi_ inside the Ankylosauridae.



Cheers

Tim
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