Variation in osteocytes morphology vs bone type in turtle shell and their exceptional preservation from the Jurassic to the present

Bone
Edwin A Cadena, Mary H Schweitzer

Abstract

Here we describe variations in osteocytes derived from each of the three bone layers that comprise the turtle shell. We examine osteocytes in bone from four extant turtle species to form a morphological 'baseline', and then compare these with morphologies of osteocytes preserved in Cenozoic and Mesozoic fossils. Two different morphotypes of osteocytes are recognized: flattened-oblate osteocytes (FO osteocytes), which are particularly abundant in the internal cortex and lamellae of secondary osteons in cancellous bone, and stellate osteocytes (SO osteocytes), principally present in the interstitial lamellae between secondary osteons and external cortex. We show that the morphology of osteocytes in each of the three bone layers is conserved through ontogeny. We also demonstrate that these morphological variations are phylogenetically independent, as well as independent of the bone origin (intramembranous or endochondral). Preservation of microstructures consistent with osteocytes in the morphology in Cenozoic and Mesozoic fossil turtle bones appears to be common, and occurs in diverse diagenetic environments including marine, freshwater, and terrestrial deposits. These data have potential to illuminate aspects of turtle biology a...Continue Reading

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Citations

Feb 19, 2013·Acta histochemica·Mark Hollis Armitage, Kevin Lee Anderson
Nov 26, 2015·Journal of Proteome Research·Timothy P ClelandMary H Schweitzer
May 8, 2013·Biological Reviews of the Cambridge Philosophical Society·Koen Stein, Edina Prondvai
May 15, 2013·Journal of Structural Biology·John D Currey, Ron Shahar
Aug 21, 2013·Bone·Michael D D'Emic, Roger B J Benson
Jul 7, 2016·Journal of Experimental Zoology. Part B, Molecular and Developmental Evolution·Alan FritzSylvain Marcellini
Nov 29, 2013·Proceedings. Biological Sciences·Mary H SchweitzerSirine C Fakra
Dec 14, 2019·Expert Review of Proteomics·Brian Thomas, Stephen Taylor
Jul 28, 2020·PeerJ·Andrés Alfonso-Rojas, Edwin-Alberto Cadena
Oct 4, 2019·PeerJ·Alida M BailleulMary H Schweitzer

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