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The making of a monster: postnatal ontogenetic changes in craniomandibular shape in the great sabercat Smilodon


, : The making of a monster: postnatal ontogenetic changes in craniomandibular shape in the great sabercat Smilodon. Plos One 7(1): E29699-E29699

Derived sabercats had craniomandibular morphologies that in many respects were highly different from those of extant felids, and this has often been interpreted functionally as adaptations for predation at extreme gape angles with hypertrophied upper canines. It is unknown how much of this was a result of intraspecific postnatal ontogeny, since juveniles of sabercats are rare and no quantitative study has been made of craniomandibular ontogeny. Postnatal ontogenetic craniomandibular shape changes in two morphologically derived sabercats, Smilodon fatalis and S. populator, were analysed using geometric morphometrics and compared to three species of extant pantherines, the jaguar, tiger, and Sunda clouded leopard. Ontogenetic shape changes in Smilodon usually involved the same areas of the cranium and mandible as in extant pantherines, and large-scale modularization was similar, suggesting that such may have been the case for all felids, since it followed the same trends previously observed in other mammals. However, in other respects Smilodon differed from extant pantherines. Their crania underwent much greater and more localised ontogenetic shape changes than did the mandibles, whereas crania and mandibles of extant pantherines underwent smaller, fewer and less localised shape changes. Ontogenetic shape changes in the two species of Smilodon are largely similar, but differences are also present, notably those which may be tied to the presence of larger upper canines in S. populator. Several of the specialized cranial characters differentiating adult Smilodon from extant felids in a functional context, which are usually regarded as evolutionary adaptations for achieving high gape angles, are ontogenetic, and in several instances ontogeny appears to recapitulate phylogeny to some extent. No such ontogenetic evolutionary adaptive changes were found in the extant pantherines. Evolution in morphologically derived sabercats involved greater cranial ontogenetic changes than among extant felids, resulting in greatly modified adult craniomandibular morphologies.

US$19.90

PMID: 22235326

DOI: 10.1371/journal.pone.0029699


Other references

Vingerhoets, A.J.J.M.; Van Huijgevoort, M.; Van Heck, G.L., 2002: Leisure sickness: a pilot study on its prevalence, phenomenology, and background. Aim: To explore the prevalence, phenomenology, and background of leisure sickness, i.e., the condition of people developing symptoms of sickness during weekends and/or vacations. Method: In order to obtain an estimate of its prevalence, a represen...

Silard, R.; Burghelea, B.; Panaitescu, D.; Burcoş, V., 1984: Ultrastructure of Dientamoeba fragilis: a study of the mononucleated stage. Archives Roumaines de Pathologie Experimentales et de Microbiologie 43(1): 87-101

Ruoslahti, E.I.; Morla, A., 1998: Fibronectin type III polypeptides. Official Gazette of the United States Patent & Trademark Office Patents 1216(3): 2986, Nov 17

Kagan, E.H.; Fox, P.G., 1959: Carcinoma of the prostate gland in a three-year-old child: report of a case. American Journal of Clinical Pathology 32: 261-269

Lit A., 1978: The mach dvorak effect studies on spatio temporal aspects of bin ocular depth discrimination. Investigative Ophthalmology & Visual Science (SUPPL): 264

Anonymous, 1976: Distribution of cereal leaf beetle Oulema melanopus. The distribution of the cereal pest Oulema melanopus (L.) in the counties of most of the north-eastern United States from the Great Lakes to the east coast, are shown on a map prepared jointly by the New Pest Detection and Survey, and Plant Protec...

L.Jiakang, 1992: Curved surface continuation of three-dimensional potential field data by using finite element moment method. Shiyou Diqiu Wuli Kantan = Oil Geophysical Prospecting 27(4): 482-492

Connor, B.A.; Herck, K. van; Damme, P. van, 2003: Rapid protection and vaccination against hepatitis A for travellers. This article reviews the merits of hepatitis A vaccination for the last-minute travellers and compared them with passive immunization. The seroconversion rates, post-exposure protection, vaccine schedule, coadministration with other vaccines and d...

Takahashi, M.; Takahata, M., 1995: Dendritic properties of uropod motoneurons and premotor nonspiking interneurons in the crayfish Procambarus clarkii Girard. Dendritic properties of uropod motoneurons and premotor nonspiking interneurons of crayfish have been studied using intradendritic recording and current injection. The input resistance of phasic motoneurons (5.20 + 0.5 M-OMEGA; mean + standard err...

Sampson, K.; Davies, D.W.lters, 1926: Some experiments on the control of bunt in wheat by copper carbonate and other chemicals, including data on the growth and yield of treated and untreated grain. Bunt in wheat was controlled, but not completely eliminated, by application of copper dusts. Best control was given by dehydrated CuSO4 and hi gh grade samples of CuCO3 containing about 50% Cut applied at the rate of 2 ounces per bushel of grain;...