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Theropod paleopathology
Theropod paleopathology is the study of injury and disease in theropod dinosaurs. In 2001, Ralph E. Molnar published a survey of pathologies in theropod dinosaur bone that uncovered pathological features in 21 genera from 10 theropod families. Pathologies have been seen on most theropod body parts, with the most common sites of preserved injury and disease being the ribs and tail vertebrae.〔 The least common sites of preserved pathology are the weight-bearing bones like the tibia, femur and sacrum.〔 Most pathologies preserved in theropod fossils are the remains of injuries, but infections and congenital deformities have also been documented.〔 Pathologies are less frequently documented in small theropods, although this may simply be because the larger bones of correspondingly larger animals would be more likely to fossilize in the first place.〔
==Identification==
Paleontologist Ralph Molnar has observed that genuine injuries and illnesses in theropod remains can be distinguished from scavenging traces because pathological bones should show signs of healing, while damage to a carcass after death would not.〔 He also notes that the location of a potential pathology on the body can help determine whether the apparent injury was inflicted before or after death.〔 He reasons that body parts like hands and feet lacked enough soft tissue to be attractive to scavengers, so apparent injuries to sites like digits and metapodials were more likely to be injuries received in life than to be traces of ''post mortem'' feeding.〔 Molnar also cautioned fellow researchers that when unusual fusions between, or asymmetry of the skull bones are found it means the individual in question was probably just suffering from advanced age rather than specific illness.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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