A Carcharodontosaurid tooth from the Hasandong Formation (Lower Cretaceous) of South Korea
A large tooth of theropod dinosaur that was recovered from the Hasandong Formation (Aptian-Albian) in South Korea is redescribed. Although the tooth was misidentified as a megalosaurid at the first time, detailed comparisons with known theropod dentition anatomy strongly indicate that this tooth belongs to an Acrocanthosaurus-like basal carcharodontosaurid theropod. This tooth is different from other carcharodontosaurid teeth from the same formation in several anatomical aspects (e.g., presence of transverse lines adjacent to the distal carina, denticle densities, crown basal ratio), indicating that carcharodontosaurid diversity in the Early Cretaceous of Korea could have been higher, although these differences may represent positional or individual variations. The presence of Acrocanthosaurus-like theropod teeth from Korea, Japan, Mongolia and China indicates that North American Acrocanthosaurus atokensis possibly represents a form that immigrated from the Asia.
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