Pathologic Bone Tissues in a Turkey Vulture and a Nonavian Dinosaur: Implications for Interpreting Endosteal Bone and Radial Fibrolamellar Bone in Fossil Dinosaurs

Chinsamy, Anusuya; Tumarkin‐Deratzian, Allison R.

doi:10.1002/ar.20991

Cited by 55 publications

(80 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Sharpey's fibers are also embedded within the irregular tissue patch, thus appearing to be continuous with those in the surrounding parallel‐fibered bone. This layer of woven fibered bone resembles the pathological, reactive bone tissue observed in other archosaurs (Reid, ; Chinsamy and Tumarkin‐Deratzian, ).…”

Section: Resultssupporting

confidence: 62%

Bone Histology of Phytosaur, Aetosaur, and Other Archosauriform Osteoderms (Eureptilia, Archosauromorpha)

Scheyer

Desojo

Cerda

2013

The Anatomical Record

View full text Add to dashboard Cite

As in other archosauriforms, phytosaurs and aetosaurs are characterized by the presence of well-developed osteoderms. Here we provide a comparative study on the microstructure of phytosaur (five taxa) and aetosaur (thirteen taxa) osteoderms. For outgroup comparison, we sampled osteoderms of the sister taxon to Aetosauria, Revueltosaurus callenderi, and the doswelliid Jaxtasuchus salomoni. Phytosaur, aetosaur, and Jaxtasuchus osteoderms are composed of a diploe structure, whereas the Revueltosaurus osteoderm microanatomy is more compact. The external cortex of phytosaurs, Revueltosaurus and Jaxtasuchus osteoderms is mainly composed of parallelfibered bone. In aetosaurs, the external cortex mainly consists of lamellar bone, with lines of resorption within the primary bone indicating successive cycles of bone erosion and deposition. The basal cortex in all the specimens is composed of parallel-fibered bone, with the cancellous internal core being more strongly developed in aetosaurs than in phytosaurs. Woven or fibro-lamellar bone was recorded in both phytosaurian and aetosaurian taxa, as well as in Jaxtasuchus. Structural fibers, which at least partly suggest metaplastic origin, were only recorded in the internal core of two phytosaurs and in the basal cortex of one aetosaur. Osteoderm thickness and cancellous to compact bone ratios appear to be subject to ontogenetic change. Minimum growth mark counts in osteoderms sampled indicate that some aetosaurs and phytosaurs lived for at least two decades. Bone microstructures are more uniform in phytosaur osteoderms and show a higher level of disparity among aetosaur osteoderms, and at least in the latter, histological features are potentially apomorphic for species/genus level. Anat Rec, 297:240-260, 2014. V C 2013 Wiley Periodicals, Inc.

show abstract

Section: Resultssupporting

confidence: 62%

Bone Histology of Phytosaur, Aetosaur, and Other Archosauriform Osteoderms (Eureptilia, Archosauromorpha)

Scheyer

Desojo

Cerda

2013

The Anatomical Record

View full text Add to dashboard Cite

show abstract

“…) showing a regional change to reticular FLB. Furthermore, close to the peripheral edge, there is a thin band of radially oriented FLB which resembles the sunburst pattern typical of periosteal reactive growth (Chinsamy and Tumarkin‐Deratzian, ). A similar band of radial FLB is also present in tibia NMQR 1705/561.…”

Section: Discussionmentioning

confidence: 93%

The Long Bone Histology of the Sauropodomorph, Antetonitrus ingenipes

Krupandan

Chinsamy

Pol

2018

The Anatomical Record

View full text Add to dashboard Cite

This analysis of the long bone microstructure of Antetonitrus ingenipes fills a crucial gap in our understanding of the growth dynamics of sauropodomorph dinosaurs. The bone histology of basal Sauropodomorpha are often characterized by zonal tissue, and contrasts with that of more derived sauropod taxa which show a shift toward the deposition of uninterrupted fibrolamellar bone (with lines of growth being either absent or only present in the outer circumferential layer). In Antetonitrus, growth patterns in the youngest individuals exhibit uninterrupted fibrolamellar bone without any growth marks. Subadult individuals, also exhibit highly vascularized fibrolamellar bone throughout the cortex, as in more derived Sauropods and Mussaurus, but growth lines occur intermittently (although not regularly) throughout the cortex as in Lessemsaurus. This indicates that Antetonitrus does not exhibit the growth dynamics previously considered characteristic of Sauropoda. Despite this, the largest (and possibly the oldest femur, NMQR 1705/163) does show an incipient external fundamental system (EFS). Our findings further suggest that growth marks are decoupled from bone size, which indicates a level of developmental plasticity in this taxon. Modulations or textural shifts in the pattern of vascular channel arrangements throughout the fibrolamellar bone in the cortex may be related to periods of resource limitations, although the lack of consistency of these modulations suggest that it is unlikely due to seasonal fluctuations. Localized bands of radial fibrolamellar bone, followed by resumption of normal growth in two samples are interpreted as evidence of a disease infliction, and subsequent recovery thereof. Anat Rec, 301:1506Rec, 301: -1518Rec, 301: , 2018 Bone microstructure (osteohistology) provides a direct record of ontogenetic growth and provides a wealth of data on various aspects of dinosaur paleobiology, such as, growth rates, ontogenetic stages, and termination of growth (e.g., Chinsamy-Turan, 2005;Cerda et al., 2013). Studies of the bone histology of sauropodomorph bones have been

show abstract

“…This well vascularized, endosteally formed tissue characteristically has a cancellous or spongy texture and consists of woven bone [9][10][11][12][13] . Endosteal deposits are sometimes caused by disease (for example, avian osteopetrosis) and in such cases they are usually accompanied by bony periosteal outgrowths 13 . In DNHM-D1874, the periosteal surface of the humerus (and other bones in the skeleton) does not have any reactive deposits, which supports our conclusion that the endosteally derived tissue is not pathologic in origin.…”

Section: Resultsmentioning

confidence: 99%

“…Several studies have shown that the deposition of avian medullary bone is directly linked to the maturation of the ovarian follicles before egg laying, and that it acts as a calcium reservoir for the production of the calcareous eggshell [9][10][11][12][13][14][15] . The deposition of medullary bone is considered to be an adaptation to compensate for the thin-walled bones of birds, from which extensive bone resorption leads to brittleness and susceptibility to fractures 11,14,15 .…”

Section: Resultsmentioning

confidence: 99%