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Paleopathology of Toyotamaphimeia machikanensis (Diapsida, Crocodylia) from the Middle Pleistocene of Central Japan

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The type specimen of Toyotamaphimeia machikanensis (Diapsida, Crocodylia) from the Osaka Group (Plio-Pleistocene) of Osaka Prefecture, Central Japan, shows multiple abnormalities. The anterior third of the mandible was amputated and shows signs of healing. The right tibia and fibula were fractured, and each of them was later fused in dislocated position with callus formation. Additionally, there are two puncture marks on a dermal scute. Based on the morphologies of these pathologies, the fauna of the community in which this animal lived, and the behavior of extant crocodilians, it is suggested that this individual survived its injuries sustained during multiple intraspecific fights for territoriality or mating.
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Keywords: Intraspecific conflicts; Japan; MOU, Museum of Osaka University (in Osaka, Japan); Middle Pleistocene; NMMNH: New Mexico Museum of Natural History; Osaka Group; Paleopathology; SCSM: South Carolina Science Museum; Toyotamaphimeia machikanensis

Document Type: Research Article

Publication date: 01 June 2004

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