Long in the tooth: evolution of sabertooth cat cranial shape

@inproceedings{Slater2008LongIT,
  title={Long in the tooth: evolution of sabertooth cat cranial shape},
  author={Graham J. Slater and Blaire Van Valkenburgh},
  booktitle={Paleobiology},
  year={2008}
}
Abstract Sabertooths exhibit one of the most extreme feeding adaptations seen in mammals. The functional consequences of accommodating extremely elongate upper canine teeth are severe, resulting in a well-documented suite of cranial modifications. We used geometric morphometric methods to study the evolution of overall shape in the skulls of extant and extinct feline and machairodontine felids, as well as extinct nimravids. Trends in skull evolution were evaluated by using relative warps… 
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References

SHOWING 1-10 OF 121 REFERENCES
Locomotor behaviour in Plio-Pleistocene sabre-tooth cats: a biomechanical analysis
The locomotor behaviour of some large extinct carnivores, including several species of Plio-Pleistocene sabre-tooth cats, is here reconstructed, based on a comparison of the cross-sectional geometric
Functional analysis of sabertooth cranial morphology
TLDR
This analysis suggests that sabertooth morphology represents modification for wider gape with retention of a pow- erful bite force at the carnassial, and elongate canines and retractile claws may have facilitated the exploitation of relatively larger prey by saberooths compared to non-sabertooth carnivores.
Aspects of the functional morphology in the cranial and cervical skeleton of the sabre‐toothed cat Paramachairodus ogygia (Kaup, 1832) (Felidae, Machairodontinae) from the Late Miocene of Spain: implications for the origins of the machairodont killing bite
The skull and cervical anatomy of the sabre-toothed felid Paramachairodus ogygia (Kaup, 1832) is described in this paper, with special attention paid to its functional morphology. Because of the
Canine tooth strength and killing behaviour in large carnivores
TLDR
The canines of sabretooth cats are shown to be more similar in shape and strength characteristics to those of living canids than felids, whereas those of the borophagine dogs and the dire wolf are closer to modern hyaenas.
Functional Morphology and the Evolution of Cats
TLDR
Three basic morpho types are proposed for cats on the basis of their upper canines: conical-toothed cats with short, unserrated canines having a round cross-section; scimitar-tooting cats having short, broad canines; and dirk­ toothed cats having long, slender canines which usually have fine serrations.
Evolution of skull shape in carnivores: 1. Representative modern carnivores
TLDR
Two functional hypotheses are proposed: mustelids and felids have the most powerful bites and canids the weakest among the four family groups studied; and visual abilities are best developed among felids and least developed amongmustelids.
Implications of the mastoid anatomy of larger extant felids for the evolution and predatory behaviour of sabretoothed cats (Mammalia, Carnivora, Felidae)
TLDR
This study supports the inference by W. Akersten that the main muscles inserting in the mastoid process in sabretooths were those originating in the atlas, rather than those from the posterior neck, sternum and forelimb, and implies larger and longer-fibred atlanto-mastoid muscles than in pantherines.
Deja vu: the evolution of feeding morphologies in the Carnivora.
TLDR
A survey of the fossil record indicates that large hypercarnivores evolve frequently, often in response to ecological opportunity afforded by the decline or extinction of previously dominant hyperc Carnivorous taxa.
Déjà vu: the evolution of feeding morphologies in the Carnivora
TLDR
A survey of the fossil record indicates that large hypercarnivores evolve frequently, often in response to ecological opportunity afforded by the decline or extinction of previously dominant hyperc Carnivorous taxa.
...
...