A densely feathered ornithomimid (Dinosauria: Theropoda) from the Upper Cretaceous Dinosaur Park Formation, Alberta, Canada

摘要: Abstract A recently discovered articulated partial skeleton of Ornithomimus from the Upper Cretaceous Dinosaur Park Formation Alberta, Canada is remarkable in extent and quality preservation integumentary structures including feathers. It first ornithomimid to preserve a tail bearing extensive plumaceous feathers that are slightly more elongate comparison those present on remainder body. However, underside hind limb distal middle femur appear devoid plumage. Overall, plumage pattern similar Struthio camelus (ostrich) other large palaeognaths, indicating probable function thermoregulation. The specimen also preserves body outline around legs, skin contour anterior femur, analogous webs extant birds. Whereas knee web birds bridges abdomen, it spans mid-femoral shaft herein referred as an femoral web. This report such soft tissue non-avian theropods. may indicate resting position was positioned anteroventrally ornithomimids than most theropods, sense have been transitional situation modern