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Re: Psittacosaurus contemporaries

On Wed, 30 Aug 2000 18:59:22 EDT Dinochandler@aol.com writes:
> What dinosaurs are known to inhabit the same area and time as 
> psittacosaurs, 
> especially _P. mongoliensis_?

Well, my sources are a little old, but here I go with the Great
*Psittacosaurus* Contemporaries List of 2000:
(Non-avian) dinosaurs known from the same formations as *P. mongoliensis*
(including *P. guyangensis*, *P. protiguanodonensis*, *P. osborni*, and
*P. tingi*):
        Theropods:  Theropoda indet.
                       *Prodeinodon mongoliensis* (indeterminate tooth taxon)
                       *P.* sp.
                       *Harpymimus okladnikovi* (unusual basal 
                       Dromaeosaurid indet.
                       Troodontid indet.
        Sauropods:  *Asiatosaurus mongoliensis* (indeterminate tooth taxon,
probably similar to *Euhelopus*)
        Ornithischians: Ankylosaurid indet.
                             *Shamosaurus scutatus* (shamosaurine ankylosaurid)
                             *Sauroplites scutiger* (possibly the same thing as
                             Iguanodontid indet. (including material similar to 
                             *Altirhinus orientalis* (big-nosed hadrosaur-like
                             *Psittacosaurus meileyingensis* 
*P. mongoliensis* is known from a number of Chinese and Mongolian
formations, and is usually considered to be upper EK in age; I currently
have it as Barremian-Aptian.
Dinosaurs known from the same formations as *P. mazongshanensis*:
        Theropods:  *Nanshiungosaurus bohlini* (therizinosaurid)
        Sauropods: Sauropoda indet. (including both peg-like and spatulate
        Ornithischians:  *Siluosaurus zhangqiani* (tiny hypsilophodont)
                              *Probactrosaurus mazongshanensis* (bulky 
                              *Archaeoceratops oshimai* (tiny ceratopian, more 
than *Psittacosaurus*)
*P. mazongshanenis* is known only from the Xinminbao Group of China,
which may be ?Aptian-?Albian.  
Dinosaurs known from the same formations as *P. meileyingensis*:
        Sauropods:  Sauropoda indet.
        Ornithischians:  *Psittacosaurus mongoliensis*
*P. meileyingensis* is known only from the Jiufotang Formation of China,
which has been dated as older than 110+-0.52Ma, making it late Aptian.
Dinosaurs known from the same formations as *P. neimongoliensis* (and *P.
ordosensis* which I suspect is the same thing):
        Saurischia: Saurischia indet. (fairly large animal)
        Theropods:  *Sinornithoides youngi* (troodontid)
        Sauropods:  *Chiayusaurus* sp. (teeth)
        Ornithischians:  Stegosaurid indet. (tooth) 
                             *Wuerhosaurus ordosensis* ( large stegosaurid)
*P. neimongoliensis* is known only from the Ejinhoro Formation of China,
possibly Barremian in age.
Dinosaurs known from the same formations as *P. sattayaraki*:
        Theropods:  Theropoda indet.
*P. sattayaraki* is known only from the Khok Kruat Formation of Thailand,
tentatively dated as ?Aptian-Albian.
Dinosaurs known from the same formations as *P. sinensis* (including *P.
youngi*): none
*P. sinensis* is known only from the Qingshan Formation, possibly of
?Aptian-Albian age.
Dinosaurs known from the same formations as *P. xinjiangensis*:
        Theropods:  *Tugulusaurus faciles* (indet. small theropod, which, if the
description is correct, interestingly has a longer radius than femur)
                       *Kelmayisaurus petrolicus* (possible ceratosaurid) 
                       *Phaedrolosaurus faciles* (possible dromaeosaurid)
        Sauropods:  cf. *Asiatosaurus mongoliensis* 
        Ornithischians:  *Wuerhosaurus homheni* (large stegosaurid)
                              Hadrosaurid indet.
*P. xinjiangensis* is known only from the Lianmugin Formation of China,
dated at ?Valanginian-Albian.

These are all the contemporaries of the named species of *Psittacosaurus*
I could dig up.  In addition, there are remains assigned to *P.* sp.,
some of them coming from the middle Barremian-age Yixian Formation, which
was also home to the theropods *Sinornithosaurus millenni*,
*Sinosauropteryx prima*, *Caudipteryx zoui*, *Beipiaosaurus inexpectus*,
*Protarchaeopteryx robusta*, and a number of avian dinosaurs
(*Confuciusiornis* and others).  Hope this helps!-*Thescelosaurus*              

Justin Tweet, *Thescelosaurus*
See "Thescelosaurus!": http://personal2.stthomas.edu/jstweet/index.htm

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