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A new transitional sauropodomorph dinosaur from the Early Jurassic of South Africa and the evolution of sauropod feeding and quadrupedalism
Cursorial ability appears to have been reduced and the weight bearing axis of the pes shifted to a medial, entaxonic position, falsifying the hypothesis that entaxony evolved in sauropods only after an obligate quadrupedal gait had been adopted. Expand
Sauropod dinosaur embryos from the Late Cretaceous of Patagonia
The first known unequivocal embryonic remains of sauropod dinosaurs—the only known non-avian dinosaur embryos from Gondwana—are described from a nesting ground in the Upper Cretaceous stage of Patagonia, Argentina and it is proposed that these specimens belong to the same sauroPod species. Expand
Bone microstructure of the divingHesperornisand the voltantIchthyornisfrom the Niobrara Chalk of western Kansas
Abstract We report on the bone microstructure of the Cretaceous birdsHesperornis regalisandIchthyornis victor. Thin sections of representative elements of both these ornithurine birds show a rapid,Expand
Physiological implications of the bone histology of Syntarsus rhodesiensis (Saurischia: Theropoda)
The general bone histology is described initially and thereafter follow speculations on the animal's thermoregulatory ability, possible evidence for sexual dimorphism, and also the probable growth strategy it employed, as reflected in its bone Histology. Expand
Functional aspects of the postcranial anatomy of the Permian dicynodont Diictodon and their ecological implications
The postcranial skeleton of the Permian dicynodont Diictodon is described, major skeletal muscles restored and functional aspects of the skeleton analyzed, and it is indicated that the animals lived close together but did not share a single large communal structure. Expand
Mesozoic avian bone microstructure: physiological implications
The bone microstructure of the Late Cretaceous birds Patagopteryx deferrariisi and members of the Enantiornithes is reported, suggesting that birds developed classic endothermy relatively late in their phylogenetic history. Expand
Polar dinosaur bone histology
ABSTRACT We report on the bone microstructure of a hypsilophodont and an ornithomimosaur from the Early Cretaceous, Otway Group of Dinosaur Cove in south-eastern Australia, which at the time lay wellExpand
A new raptorial dinosaur with exceptionally long feathering provides insights into dromaeosaurid flight performance.
It is demonstrated how the low-aspect-ratio tail of the new fossil would have acted as a pitch control structure reducing descent speed and thus playing a key role in landing and insight into the flight performance of microraptorines is provided. Expand
Variation of the Outer Circumferential Layer in the Limb Bones of Birds
The first comparative allometric study of the relative OCL thickness (expressed as a fraction of the diaphyseal radius) in modern birds is presented, suggesting that its relative thickness probably correlates with the amount of slow, residual growth, which is on the average larger in small birds. Expand
The analysis of bone histology of gorgonopsian, therocephalian and cynodont genera, ranging from the Late Permian to Early Jurassic, reveals a predominance of cortical fibrolamellar bone tissue in most skeletal elements. Expand