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LONG BONE HISTOLOGY OF THE HADROSAURID DINOSAUR MAIASAURA PEEBLESORUM: GROWTH DYNAMICS AND PHYSIOLOGY BASED ON AN ONTOGENETIC SERIES OF SKELETAL ELEMENTS
It is concluded that Maiasaura did not grow at all like living non-avian reptiles, which cannot be considered informative models for most aspects of dinosaurian growth (or physiology, to the extent that growth rates reflect metabolism).
GROWTH IN SMALL DINOSAURS AND PTEROSAURS: THE EVOLUTION OF ARCHOSAURIAN GROWTH STRATEGIES
The evolution of life history strategies in dinosaurs and pterosaurs, as they relate to rates of growth and adult body sizes, will be better understood as more complete histological studies place these data into phylogenetic and ontogenetic contexts.
Variation in dinosaur skeletochronology indicators: implications for age assessment and physiology
Twelve different bones from the skeleton of the holotype specimen of the hadrosaurian dinosaur Hypacrosaurus stebingeri were thin-sectioned to evaluate the significance of lines of arrested growth (LAGs) in age assessments, finding the tibia was found to have experienced the least amount of reconstruction, but was still not optimal for skeletochronology.
Nest and egg clutches of the dinosaur Troodon formosus and the evolution of avian reproductive traits
Non-avian coelurosaurians possess several primitive features found in crocodilians and several derived features shared with birds (relatively larger and potentially asymmetric eggs, one egg produced per oviduct at a time, loss of egg retention, open nests, brooding).
Torosaurus Marsh, 1891, is Triceratops Marsh, 1889 (Ceratopsidae: Chasmosaurinae): Synonymy Through Ontogeny
The ontogenetic analyses reveal that Triceratops and “Torosaurus” actually represent growth stages of a single genus, contributing to an unfolding view of extremely reduced dinosaur diversity just before the end of the Mesozoic Era.
The evolution and function of thyreophoran dinosaur scutes: implications for plate function in stegosaurs
It seems more likely, as in other groups of dinosaurs, that the variation of dermal armor form in stegosaurs was primarily linked to species individuation and recognition, perhaps secondarily to inter- and intraspecific display, and rarely to facultative thermoregulation.
EMBRYOS AND EGGS FOR THE CRETACEOUS THEROPOD DINOSAUR TROODON FORMOSUS
Elongate and asymmetric eggs of the oospecies Prismatoolithus levis occur regularly in the Upper Cretaceous Two Medicine Formation of western Montana and show several aspects either shared or convergent with some birds, and further demonstrate the close relationship of Troodontidae and Aves.
40Ar/39Ar age and correlation of the nonmarine Two Medicine Formation (Upper Cretaceous), northwestern Montana, U.S.A.
The age of the nonmarine Two Medicine Formation of northwestern Montana is currently based upon correlations with K–Ar-dated Western Interior ammonite zones. 40Ar/39Ar dating of biotite and…
On the bone histology of some Triassic pseudosuchian archosaurs and related taxa
Major cranial changes during Triceratops ontogeny
It is hypothesized that the changes in horn orientation and epoccipital shape function to allow visual identity of juveniles, and signal their attainment of sexual maturity, in Triceratops.