Stegosauridae indet. Buffetaut et al. 2001, 1971

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

Stegosauridae indet. Buffetaut et al. 2001

Material.

SM2011-1-001 (renumbered from KPS2- 1 in Buffetaut et al. (2001)), a single posterior dorsal vertebra (Fig. 3A ).

Locality and age.

Ban Khok Sanam locality, Kham Muang District, Kalasin Province; the lower Phu Kradung Formation, Late Jurassic.

Previous study.

This the first evidence of a thyreophoran dinosaur in Southeast Asia. The specimen is identified as belonging to the family Stegosauridae , which is more advanced than primitive taxa, such as huayangosaurid Huayangosaurus from the Middle Jurassic of China ( Buffetaut et al. 2001). The specimen has a much higher neural arch and more upright transverse processes, indicating that it should be referred to the Stegosauridae ( Buffetaut et al. 2001).

Comments.

The anterior part of the centrum and the neural arch of SM2011-1-001 has been destroyed, but likely to possess centra of the dorsal vertebrae longer than wide as most stegosaurians, except for Miragaia longicollum ( Maidment et al. 2008; Mateus et al. 2009).

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).