Intracranial Mobility in Mosasaurs
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Varanoid Tooth Eruption and Implantation Modes in a Late Cretaceous Mosasaur
Erupting teeth are some of the oldest witnesses of developmental processes in the vertebrate fossil record and provide an important resource for vertebrate cladistics. Here, we have examined a mosasaur jaw fragment from central Texas using ultrathin ground section histology and 3D tomographic imaging to assess features critical for the cladistic placement of mosasaurs among varanoids vs. snakes...
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Mosasaurs (Squamata: Mosasauridae) were a highly diverse, globally distributed group of aquatic lizards in the Late Cretaceous (98-66 million years ago) that exhibited a high degree of adaptation to life in water. To date, despite their rich fossil record, the anatomy of complete mosasaur sclerotic rings, embedded in the sclera of the eyeball, has not been thoroughly investigated. We here descr...
متن کاملMolecular evidence for a terrestrial origin of snakes.
Biologists have debated the origin of snakes since the nineteenth century. One hypothesis suggests that snakes are most closely related to terrestrial lizards, and reduced their limbs on land. An alternative hypothesis proposes that snakes are most closely related to Cretaceous marine lizards, such as mosasaurs, and reduced their limbs in water. A presumed close relationship between living moni...
متن کاملThe Condor
The remarkable Cretaceous birds with teeth, widel; cited in paleontological and biological literature as an intermediate evolutionary stage between reptiles and modern birds, are known almost exclusively from the monograph “Odontornithes” and a few preliminary publications by 0. C. Marsh, their discoverer. Marsh’s reconstructions have been copied extensively and formed the basis for discussions...
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Introduction:Intracranial hemorrhage (ICH) is divided into two traumatic and non-traumatic categories. The present study sought to investigate the anatomical properties of non-traumatic intracranial hemorrhage in Kerman, Iran. Method:A total of 305 non-traumatic ICH cases were chosen in Shafa medical center. Data from patients’ files and CT scan images, including demographic factors and type o...
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تاریخ انتشار 2009