[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]

RE: Coelophysid Distribution & Evolution

Amtoine Grant wrote:

I know Coelophysid remains have been found in North America, Europe & North Africa.

I wasn't aware that coelophysoids have been found in North Africa. (That doesn't mean they weren't found here - I just haven't heard of any in that particular neck of the woods.) Coelophysoid material is certainly known from southern Africa, in the form of _Megapnosaurus rhodesiensis_ (formerly _Syntarsus rhodesiensis_) from Zimbabwe, which probably represents a species of _Coelophysis_ (_C. rhodesiensis_).

As you note, there is also coelophysoid material from Europe. These include various named species, such as _Procompsognathus triassicus_ and _Liliensternus liliensterni_ (both Germany), and _"Liliensternus" airelensis_ (France), as well as "_Syntarsus_" material from Wales and a bunch of other fragmentary remains.

Asia... Irmis (2004) reports _Megapnosaurus_ material from the Early Jurassic of China. The Indian taxon _Alwalkeria maleriensis_ has been called a coelophysoid, but the evidence is weak. "_Dilophosaurus" sinensis_ might not even be a ceratosaur.

And of course there is the abundant coelophysoid material from the U.S.: _Coelophysis bauri_, _Segisaurus halli_, "_Syntarsus"_ kayentakatae_, _Dilophosaurus wetherilli_, _Gojirasaurus quayi_ and some other poorly known (and possibly indeterminate) species. Coelophysoid afinities have been touted for the South American theropod _Zupaysaurus_, but these have yet to come to fruition.

Also, how many coelophysids are known worldwide from the Late Triassic [and Early Jurassic]?

http://personal2.stthomas.edu/jstweet/neotheropoda.htm has a nice summary.

Also, it seems coelophysids went extinct after the Early Jurassic, except for Lilensternus & Dilophosaurus, which seem to be direct derivations of North American species.

No, _Liliensternus_ and _Dilophosaurus_ are Early Jurassic. If there were any coelophysoids known from after the Early Jurassic, I'd like to hear about them. Looks like they may have gone extinct then. They had a good run.