Journal
ANATOMICAL RECORD-ADVANCES IN INTEGRATIVE ANATOMY AND EVOLUTIONARY BIOLOGY
Volume 292, Issue 9, Pages 1478-1484Publisher
WILEY
DOI: 10.1002/ar.20991
Keywords
nonavian dinosaurs; pathological bone; radial fibrolamellar bone; medullary bone; hypertrophic osteopathy; osteopetrosis
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Funding
- National Research Foundation (South Africa)
- TUBITAK (Turkey)
- National Science Foundation (USA)
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We report on similar pathological bone microstructure in an extant turkey vulture (Cathartes aura) and a nonavian dinosaur from Transylvania. Both these individuals exhibit distinctive periosteal reactive bone deposition accompanied by endosteal bone deposits in the medullary cavity. Our findings have direct implications on the two novel bone tissues recently described among nonavian dinosaurs, radial fibrolamellar bone tissue and medullary bone tissue. On the basis of the observed morphology of the periosteal reactive bone in the turkey vulture and the Transylvanian dinosaur, we propose that the radial fibrolamellar bone tissues observed in mature dinosaurs may have had a pathological origin. Our analysis also shows that on the basis of origin, location, and morphology, pathologically derived endosteal bone tissue can be similar to medullary bone tissues described in nonavian dinosaurs. As such, we caution the interpretation of all endosteally derived bone tissue as homologous to avian medullary bone. Anat Rec, 292:1478-1484, 2009. (C) 2009 Wiley-Liss, Inc.
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