Abstract
The sabertooth cat, Smilodon fatalis, was an enigmatic predator without a true living analog. Their elongate canine teeth were more vulnerable to fracture than those of modern felids, making it imperative for them to immobilize prey with their forelimbs when making a kill. As a result, their need for heavily muscled forelimbs likely exceeded that of modern felids and thus should be reflected in their skeletons. Previous studies on forelimb bones of S. fatalis found them to be relatively robust but did not quantify their ability to withstand loading. Using radiographs of the sabertooth cat, Smilodon fatalis, 28 extant felid species, and the larger, extinct American lion Panthera atrox, we measured cross-sectional properties of the humerus and femur to provide the first estimates of limb bone strength in bending and torsion. We found that the humeri of Smilodon were reinforced by cortical thickening to a greater degree than those observed in any living felid, or the much larger P. atrox. The femur of Smilodon also was thickened but not beyond the normal variation found in any other felid measured. Based on the cross-sectional properties of its humerus, we interpret that Smilodon was a powerful predator that differed from extant f...Continue Reading
References
Jan 1, 1978·Acta Anatomica·W J Gonyea
Dec 1, 1991·American Journal of Physical Anthropology·B DemesK Selpien
Mar 7, 1988·Journal of Theoretical Biology·J E Bertram, A A Biewener
Mar 1, 1983·American Journal of Physical Anthropology·C B Ruff, W C Hayes
Mar 1, 1995·Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research·C T RubinS D Bain
Jan 1, 1994·American Journal of Physical Anthropology·E TrinkausC B Ruff
May 1, 1993·American Journal of Physical Anthropology·C B RuffC S Larsen
Jan 24, 1998·Journal of Morphology·R E Heinrich, A R Biknevicius
May 20, 1998·American Journal of Physical Anthropology·B DemesC T Rubin
Nov 3, 1998·Journal of Molecular Evolution·E EizirikF M Salzano
Feb 5, 2000·Journal of Human Evolution·C B Ruff
Aug 31, 2000·Journal of Human Evolution·J D PolkJ A Runestad
Dec 18, 2001·American Journal of Physical Anthropology·B DemesC T Rubin
Aug 7, 2002·Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research·Alexander G RoblingCharles H Turner
Jan 20, 2004·American Journal of Physical Anthropology·Daniel E LiebermanBrigitte Demes
Apr 9, 2005·Proceedings. Biological Sciences·Stephen WroeJeffrey Thomason
May 20, 2005·Annals of Anatomy = Anatomischer Anzeiger : Official Organ of the Anatomische Gesellschaft·Motoki SasakiJunzo Yamada
Jan 21, 2006·American Journal of Physical Anthropology·Christopher RuffErik Trinkaus
Jul 18, 2006·Journal of Morphology·Per Christiansen
Oct 4, 2007·Proceedings of the National Academy of Sciences of the United States of America·Colin R McHenryEleanor Cunningham
Oct 16, 2007·BioTechniques·Tony J Collins
Mar 4, 2008·Zoology : Analysis of Complex Systems, ZACS·Stephen WroeMauricio Anton
Jan 6, 2009·Journal of Morphology·Julie Meachen-Samuels, Blaire Van Valkenburgh
Mar 10, 2009·PloS One·Michael DoubeSandra Shefelbine
Mar 24, 2009·Molecular Ecology·Ross BarnettAlan Cooper
Dec 31, 2009·Journal of Anatomy·Manuel J SalesaJorge Morales
May 18, 2012·Journal of Morphology·Adam Hartstone-RoseChristopher A Shaw
Citations
Jun 15, 2014·BMC Evolutionary Biology·Alberto Martín-SerraPaul Palmqvist
Oct 31, 2012·PloS One·Per Christiansen, John M Harris
Jan 10, 2013·PloS One·Larisa R G DesantisPeter S Ungar
May 18, 2012·Journal of Morphology·Adam Hartstone-RoseChristopher A Shaw
Oct 16, 2012·Journal of Morphology·Anthony WalmsleyCarlo Meloro
Sep 14, 2012·Journal of Morphology·Joshua X SamuelsStacey A Sakai
Apr 30, 2014·Journal of Evolutionary Biology·J A MeachenR W Sadleir
Jun 16, 2015·Journal of Evolutionary Biology·A R CuffA Goswami
Apr 15, 2016·Journal of Anatomy·Andrew R CuffJohn R Hutchinson
Apr 16, 2016·Journal of Anatomy·Andrew R CuffJohn R Hutchinson
Mar 22, 2013·PloS One·Steven C Wallace, Richard C Hulbert
Oct 2, 2014·PloS One·Jeffrey G Brown
Jan 24, 2014·PloS One·Alberto Martín-SerraPaul Palmqvist
Jul 2, 2016·PeerJ·Eric Scott, Kathleen B Springer
Jul 14, 2017·Journal of Anatomy·Alberto Martín-SerraPaul Palmqvist
Sep 28, 2017·PloS One·Katherine LongValerie J P Syverson
Oct 1, 2020·Proceedings. Biological Sciences·Stephan LautenschlagerThomas L Stubbs
Jun 18, 2020·PeerJ·Alberto Valenciano, Romala Govender
Aug 16, 2017·Nature Ecology & Evolution·Caitlin BrownBlaire Van Valkenburgh
Oct 11, 2017·Biological Reviews of the Cambridge Philosophical Society·Mauro GalettiJens-Christian Svenning
Oct 22, 2020·Evolution; International Journal of Organic Evolution·Margot MichaudAnne-Claire Fabre
Apr 17, 2021·Current Biology : CB·Larisa R G DeSantisErnest L Lundelius