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Maiasaura is a large herbivorous saurolophine hadrosaurid ("duck-billed") dinosaur genus that lived in the area currently covered by the state of Montana and the province of Alberta, Canada, in the Upper Cretaceous Period, from 86.3 to 70.6 million years ago. Maiasaura peeblesorum is the state fossil of Montana.
Choristodera is an extinct order of semiaquatic diapsid reptiles that ranged from the Middle Jurassic, or possibly Triassic, to the Miocene. Choristoderes are morphologically diverse, with the best known members being the crocodile-like neochoristoderes such as Champsosaurus. Other choristoderans had lizard-like or long necked morphologies. Choristoderes appear to have been confined to the Northern Hemisphere, having been found in North America, Asia, and Europe, and possibly also North Africa. Choristoderes are generally thought to be derived neodiapsids that are close relatives or members of Sauria.
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James Allen Hopson is an American paleontologist and professor at the University of Chicago. His work has focused on the evolution of the synapsids, and has been focused on the transition from basal synapsids to mammals, from the late Paleozoic through the Mesozoic Eras. He received his doctorate at Chicago in 1965, and worked at Yale before returning to Chicago in 1967 as a faculty member in Anatomy, and has also been a research associate at the Field Museum of Natural History since 1971. He has also worked on the paleobiology of dinosaurs, and his work, along with that of Peter Dodson, has become a foundation piece for the modern understanding of duckbill crests, social behavior, and variation.
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Christian Alfred Sidor is an American vertebrate paleontologist. He is currently a Professor in the Department of Biology, University of Washington in Seattle, as well as Curator of Vertebrate Paleontology and Associate Director for Research and Collections at the Burke Museum of Natural History and Culture. His research focuses on Permian and Triassic tetrapod evolution, especially on therapsids.
Huskerpeton is an extinct genus of recumbirostran from the Early Permian period. They belong to the order Microsauria, which was established in 1863 by Dawson, and was quickly expanded to include many different small taxa. They lived in what is now Nebraska and Kansas. The holotype of Huskerpeton was uncovered at the Eskridge formation in Nebraska, which is part of how it got its name.
This glossary explains technical terms commonly employed in the description of dinosaur body fossils. Besides dinosaur-specific terms, it covers terms with wider usage, when these are of central importance in the study of dinosaurs or when their discussion in the context of dinosaurs is beneficial. The glossary does not cover ichnological and bone histological terms, nor does it cover measurements.
The supratemporal bone is a paired cranial bone present in many tetrapods and tetrapodomorph fish. It is part of the temporal region, usually lying medial (inwards) relative to the squamosal and lateral (outwards) relative to the parietal and/or postparietal. It may also contact the postorbital or intertemporal, or tabular, when those bones are present.
The postfrontal is a paired cranial bone found in many tetrapods. It occupies an area of the skull roof between and behind the orbits, lateral to the frontal and parietal bones, and anterior to the postorbital bone.
References
- ↑ Jollie, Malcolm T. (1960). "The head skeleton of the lizard". Acta Zoologica. 41 (1–2): 1–64. doi:10.1111/j.1463-6395.1960.tb00474.x. ISSN 1463-6395.
- ↑ Hopson, James A.; Rougier, Guillermo W. (1993-01-01). "Braincase structure in the oldest known skull of a therian mammal; implications for mammalian systematics and cranial evolution". American Journal of Science. 293 (A): 268–299. doi:10.2475/ajs.293.A.268. ISSN 0002-9599.
- ↑ Holliday, Casey M.; Witmer, Lawrence M. (2009-09-12). "The epipterygoid of crocodyliforms and its significance for the evolution of the orbitotemporal region of eusuchians". Journal of Vertebrate Paleontology. 29 (3): 715–733. doi:10.1671/039.029.0330. ISSN 0272-4634.
- ↑ Clark, James M.; Welman, Johann; Gauthier, Jacques A.; Parrish, J. Michael (1993-03-18). "The laterosphenoid bone of early archosauriforms". Journal of Vertebrate Paleontology. 13 (1): 48–57. doi:10.1080/02724634.1993.10011487. ISSN 0272-4634.
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