Re: Dinosaur statistics 2005

[Tim Williams <twilliams_alpha@hotmail.com>]

Mike Taylor wrote:

> There are a few dinosaurs known from that part of the world: _Isanosaurus_, 
> _Phuwiangosaurus_, _Siamosaurus_ and _Siamotyrannus_ from Thailand, and 
> _Tangvayosaurus_ from Laos.

There's a few others to add to Mike's list.  The earliest SE Asian dinosaur 
(AFAIK) is a fairly large but indeterminate prosauropod (or some kind of 
sauropodomorph, at least) from the Nam Phong Formation (Late Triassic) of 
Thailand.  There's some Late Jurassic dino material, also from Thailand, in 
the form of sauropod teeth.

There's an unnamed (not officially, anyway) ornithomimosaur from the same 
assemblage (Sao Khua Formation) that yielded _Siamotyrannus_, _Siamosaurus_ 
and _Phuwiangosaurus_.  _Psittacosaurus sattayaraki_, known from the younger 
Khok Kruat Formation of Thailand, is a small ceratopsian, but has been 
regarded as a nomen dubium by some researchers.  From the same formation 
comes an indeterminate (so far) ornithopod, described as an "iguanodontid".  
An alleged hadrosaur from Laos (_Mandschurosaurus laosensis_) appears to be 
more basally positioned within the Iguanodontia, and comes from a locality 
possibly of the same age as Khok Kruat across the border (Aptian-Albian).

> _Phuwiangosaurus_ Martin, Buffetaut and Suteethorn 1994
> is an Early Cretaceous sauropod that's been placed in several groups
> but now seems to be titanosaur; _[snip] _Tangvayosaurus_ Allain, Taquet, 
> Battail, Dejax,
> Richir, Veran, Limon-Duparcmeur, Vacant, Mateus, Sayarath, Khenthavong
> and Phouyavong 1999 is a Titanosauria from the Aptian or Albian.

_Tangvayosaurus_ and _Phuwiangosaurus_ appear to be very closely related to 
one another.

Cheers

Tim