New insights into the lifestyle of Allosaurus (Dinosauria: Theropoda) based on another specimen with multiple pathologies.

摘要: Adult large-bodied theropods are often found with numerous pathologies. A large, almost complete, probably adult Allosaurus specimen from the Howe Stephens Quarry, Morrison Formation (Late Kimmeridgian-Early Tithonian), Wyoming, exhibits multiple Pathologic bones include left dentary, two cervical vertebrae, one and several dorsal ribs, scapula, humerus, right ischium, pedal phalanges. These pathologies can be classified as follows: fifth vertebra, ribs ischium traumatic, a callus on shaft of phalanx II-2 is traumatic-infectious. Traumatically fractured elements exposed to frequent movement (e.g., scapula ribs) show tendency develop pseudarthroses instead callus. The in lower jaw reduced extensor tubercle most likely traumatic or developmental origin. fourth origin idiopathic, that humerus could developmental, infectious whereas IV-1 idiopathic. With exception all traumatic/traumatic-infectious pathologic unambiguous evidences healing, indicating respective did not cause death this individual. Alignment rib side suggests may have been caused by single event. ischial fracture fatal. occurrence lesions interpreted again underlines experienced injuries during life, an active predatory lifestyle, their survival perhaps supports gregarious behavior for Allosaurus. Alternatively, events also related presence non-endothermic metabolic rates allow based sporadic food consumption scavenging behavior. Signs consistent infections scarce locally restricted, successful prevention spread pathogens, it case extant reptiles (including birds).