First occurrence of brachyopid temnospondyls in Southeast Asia and review of the Mesozoic amphibians from Thailand Author Nonsrirach, Thanit Author Manitkoon, Sita Author Lauprasert, Komsorn text Fossil Record 2021 2021-03-12 24 1 33 47 http://dx.doi.org/10.5194/fr-24-33-2021 journal article 298643 10.5194/fr-24-33-2021 d7300392-709d-47cc-a2e5-a51acfe8e4cc 2193-0074 10965797 Cyclotosaurus cf. posthumus Reference material D.M. R . no. Ch.D 001 ( Fig. 2a–c ); a posterior part of a skull ( Ingavat and Janvier, 1981 ). Formation/age Huai Hin Lat Formation (Carnian–Norian). Locality and sediment The specimen was discovered in 1981 at an outcrop near the Chulabhorn Dam, Khon San District , Chaiyaphum Province . The fossil assemblage layer consists of a grey to red conglomerate . Description D.M. R . no. Ch.D 001 is a posterior part of a comparatively large skull (approximately 20 cm wide and 11 cm long), but the lateral part of the right side is missing. However, a pair of otic notches and a pineal foramen are preserved. The pattern of the ornamentation and the shallow interotic embayment of this skull allow an assignment to Cyclotosaurus ( Fraas, 1913 ; Ingavat and Janvier, 1981 ; Damiani, 2001 ) and are similar to those of the holotype of Cyclotosaurus posthumus Fraas, 1913 from the Upper Middle Keuper, Bavaria ( Germany ).