Psittacosaurus sattayaraki Buffetaut & Suteethorn, 1992

Manitkoon, Sita, Deesri, Uthumporn, Warapeang, Prapasiri, Nonsrirach, Thanit & Chanthasit, Phornphen, 2023, Ornithischian dinosaurs in Southeast Asia: a review with palaeobiogeographic implications, Fossil Record 26 (1), pp. 1-25 : 1

Psittacosaurus sattayaraki Buffetaut & Suteethorn, 1992

Material.

holotype SM2016-1-163 (renumbered from TF 2449a by Buffetaut and Suteethorn (1992)), right dentary (Fig. 3F ); SM2016-1-164 (renumbered from TF 2449b by Buffetaut and Suteethorn (1992)) maxilla fragment.

Locality and age.

Ban Dong Bang Noi, Lat Yai Subdistrict, Mueang District, Chaiyaphum Province; late Early Cretaceous Khok Kruat Formation (Aptian).

Previous study.

Apart from the ornithopods mentioned above, another valid taxon from the Khok Kruat Formation is a small basal ceratopsian. P. sattayaraki was described from a well-preserved dentary (SM2016-1-163) and a maxilla fragment (SM2016-1-164), and it is the southernmost known occurrence of this genus ( Buffetaut and Suteethorn 1992). However, the incompleteness of the material makes the validity of the taxa questionable ( Sereno 2000; You and Dodson 2004). Buffetaut, Suteethorn, and Khansubha (2007) defended P. satayaraki as a species of Psittacosaurus , based on the tooth and dentary morphology clearly exhibiting fan-shaped tooth crowns bearing bulbous primary ridge, and a markedly convex alveolar border in lateral or medial view and an incipient ventral flange of the dentary. The taxon has been accepted as a valid species of Psittacosaurus in other reviews ( Averianov et al. 2006; Lucas 2006).

Comment.

Although Psittacosaurus was abundant in the Early Cretaceous of Eastern Asia (especially China, Mongolia, and Siberia), it is worth noting that material of Psittacosaurus seems to be scarce in Southeast Asia. In Thailand, only fragmentary materials were discovered in Chaiyaphum and Khon Kaen Provinces, and have not been found in other Khok Kruat localities ( Manitkoon et al. 2022).

Figures

Figure 3. Exceptional specimen of ornithischian dinosaurs from Thailand. Stegosaurid vertebra (A. SM 2011 - 1 - 001), Phu Noi neornithischian left dentary (B. PRC 149), Phu Noi neornithischian articulated skeleton (C. PRC 150), Dan Luang neornithischian left femur (D. SM 2016 - 1 - 081), Psitacosaurus indet. Right femur (E. SM 2016 - 1 - 080), Psitacosaurus sattayaraki right dentary (F. SM 2016 - 1 - 163), Khok Pha Suam iguanodontian dorsal vertebra (G. SM 2021 - 1 - 113), Khok Pha Suam iguanodontian left femur (H. SM 2021 - 1 - 118), Siamodon nimngami left maxilla (I. PRC- 4), Ratchasimasaurus suranareae left dentary (J. NRRU-A 2064), Sirindhorna khoratensis left maxilla (K. NRRU-A 2048), Sirindhorna khoratensis right dentary (L. NRRU 3001 - 167); A and G in anterior view; B-D, and H-J in lateral view; E, F and L in medial view. Scale bars: 10 cm (A, C-E, G-L); 5 cm (B, F).