Patterns of morphospace occupation and mechanical performance in extant crocodilian skulls: A combined geometric morphometric and finite element modeling approach
- S. Pierce, K. Angielczyk, E. Rayfield
- Geography, Environmental ScienceJournal of morphology
- 1 July 2008
It is shown that biomechanical stress and the hydrodynamic properties of the skull show a strong relationship with the distribution of crocodilians in skull morphospace, whereas phylogeny and biogeography show weak or no correlation.
Three-dimensional limb joint mobility in the early tetrapod Ichthyostega
It is shown that Ichthyostega could not have employed typical tetrapod locomotory behaviours, such as lateral sequence walking, and was unlikely to have made some of the recently described Middle Devonian trackways.
Virtual reconstruction of the endocranial anatomy of the early Jurassic marine crocodylomorph Pelagosaurus typus (Thalattosuchia)
Using µCT data to virtually reconstruct the endocranial anatomy of Pelagosaurus typus indicates that physiological and sensory adaptations to marine life occurred early in thalattosuchian evolution, predating the origins of flippers, tail flukes, and hydrodynamic body forms seen later in metriorhynchoids.
Shape and mechanics in thalattosuchian (Crocodylomorpha) skulls: implications for feeding behaviour and niche partitioning
Evidence also indicates that morphological and functional differentiation of the skull occurred as a result of dietary preference, allowing closely related sympatric species to exploit a limited environment.
Comparative axial morphology in pinnipeds and its correlation with aquatic locomotory behaviour
Comparison of the vertebral functional profiles in the fossil taxon Allodesmus kernensis with those of modern pinniped clades reveals that this extinct pinnipes may also have used a combination of pectoral and pelvic oscillatory movements during swimming, but in a manner opposite to that of Odobenus.
PELAGOSAURUS TYPUS BRONN, 1841 (MESOEUCROCODYLIA: THALATTOSUCHIA) FROM THE UPPER LIAS (TOARCIAN, LOWER JURASSIC) OF SOMERSET, ENGLAND
Abstract The thalattosuchian crocodyliform Pelagosaurus typus Bronn, 1841 is fully documented and described from the Upper Lias (Toarcian, Lower Jurassic) of England. The material under study is part…
Morphospace occupation in thalattosuchian crocodylomorphs: skull shape variation, species delineation and temporal patterns
The temporal distribution of thalattosuchian species and morphotypes demonstrate a clear and highly correlated relationship with sea level curves and mass extinction events through the Jurassic and the Early Cretaceous.
Tail-propelled aquatic locomotion in a theropod dinosaur
Discovery that the giant theropod dinosaur Spinosaurus has a large flexible tail indicates that it was primarily aquatic and swam in a similar manner to extant tail-propelled aquatic vertebrates.
The scaling of postcranial muscles in cats (Felidae) I: forelimb, cervical, and thoracic muscles
The results support the inference that larger felid species have relatively weaker anterior postcranial musculature compared with smaller species, due to an absence of significant positive allometry of forelimb or vertebral muscle architecture.
Morphological and functional changes in the vertebral column with increasing aquatic adaptation in crocodylomorphs
- J. Molnar, S. Pierce, B. Bhullar, A. Turner, J. Hutchinson
- Biology, Environmental ScienceRoyal Society Open Science
- 1 November 2015
The most important structures for determining RoM and stiffness of the trunk in Crocodylus were different in dorsoventral versus mediolateral bending, suggesting that changes in osteoderm and rib morphology over crocodylomorph evolution would have affected movements in some directions more than others.