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Re: Bullatosauria, Arctometatarsalia

On Thu, 10 Aug 1995 Stang1996@aol.com wrote:

> Please tell me what Bullatosauria and Arctometatarsalia include.  I'm
> confused.
> Peter Buchholz
> Stang1996@aol.com
I hope Tom Holtz doesn't mind me jumping in here (these taxa are his 
inventions). The Arctometatarsalia are a group of coelurosaurians that 
have a  middle metatarsal (homologous with the third metatarsal of 
primitive amniotes) that is "pinched" at it's upper end. It includes 
Tyrranosauridae, Avimimus, Elmisauridae (whatever that is - thats another 
story), Troodontidae and Ornithomimosauria. The Bullatosauria is a more 
exclusive clade within the Arctometatarsalia that icludes the 
Troodontidae and the Ornithomimosauria. These two are linked together 
largely on the basis of their swollen parasphenoids.

Adam Yates