Open Paleo

Sirindhorna

Shibata et al., 2015 sih-rin-DHOR-nuh

Named in honor of Princess Maha Chakri Sirindhorn of Thailand, in recognition of support for Thai paleontology.

121.4–113.2 million years ago Aptian, Early Cretaceous
Early Cretaceous stages

Sirindhorna is a genus of hadrosauroid ornithopod dinosaur from Early Cretaceous deposits of northeastern Thailand.

Diagnosis

  1. Sagittal crest extending along entire dorsal surface of parietal and reaching frontoparietal suture
  2. Relatively straight frontoparietal suture
  3. Caudodorsally faced supraoccipital
  4. No participation of supraoccipital in foramen magnum
  5. Antorbital fossa of maxilla not visible in lateral view
  6. Simple troughs for dentary alveoli with vertical walls and tooth crown-shaped base

Species

Sirindhorna khoratensis Shibata et al., 2015

Type species

Named for Khorat, the informal name of Nakhon Ratchasima Province in northeastern Thailand, where the fossils were discovered.

Holotype
NRRU3001-166 , Nakhon Ratchasima Rajabhat University
Material
Articulated braincase comprising supraoccipital, exoccipitals, opisthotics, prootics, parietals, frontals, basioccipital, basisphenoid orbitosphenoids, parasphenoid, laterosphenoids, with postorbitals and squamosals
Horizon
Khok Kruat Formation, Aptian, Early Cretaceous , 121.4–113.2 million years ago
Locality
Ban Saphan Hin, Nakhon Ratchasima, Thailand

References

  1. Shibata, M.; Jintasakul, P.; Azuma, Y.; You, H. L. (2015). A New Basal Hadrosauroid Dinosaur from the Lower Cretaceous Khok Kruat Formation in Nakhon Ratchasima Province, Northeastern Thailand. PLOS ONE 10(12): e0145904. Public Library of Science (PLoS). doi:10.1371/journal.pone.0145904 shibata2015a