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Clade Amniota. "Labyrinthodontia" (Greek, 'maze-toothed') is an informal grouping of extinct predatory amphibians which were major components of ecosystems in the late Paleozoic and early Mesozoic eras (about 390 to 150 million years ago). Traditionally considered a subclass of the class Amphibia, modern classification systems recognize that ...
Vertebrae from the pectoral region of the holotype specimen. The vertebrae that transitioned between the neck and back vertebrae in the pectoral region of plesiosaurs, close to the front margin of the forelimb girdle, are often termed pectoral vertebrae. Elasmosaurus had three pectoral vertebrae, which is a common number for elasmosaurids. The ...
Paranthodon (/ pəˈrænθədɒn / pə-RAN-thə-don[5]) is a genus of stegosaurian dinosaur that lived in what is now South Africa during the Early Cretaceous, between 139 and 131 million years ago. Discovered in 1845, it was one of the first stegosaurians found. Its only remains, a partial skull, isolated teeth, and fragments of vertebrae ...
The palatine bones are situated at the back of the nasal cavity between the maxilla and the pterygoid process of the sphenoid bone. They contribute to the walls of three cavities: the floor and lateral walls of the nasal cavity, the roof of the mouth, and the floor of the orbits. They help to form the pterygopalatine and pterygoid fossae, and ...
Stegouros differs from its close relative Antarctopelta in its smaller body size, relatively larger neural canal, longer dorsosacral vertebrae, higher and narrower vertebral bodies of the sacral vertebrae, absence of ossified tendons on the tail, teeth with six serrations on the anterior margin instead of seven or eight, and cingula, thickened ...
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The neck was typically composed of 15 vertebrae, though in Barosaurus, the neck probably had 16 vertebrae as the result of the incorporation of an additional vertebra from the dorsal series. [10] The habitual neck posture of diplodocids is controversial; studies have proposed postures ranging from nearly straight and below horizontal [ 11 ] to ...
Priconodon (meaning "saw cone tooth" [1]) is an extinct genus of ankylosaurian dinosaur (perhaps nodosaurid), mainly known from its large teeth.Its remains have been found in the Aptian-Albian age Lower Cretaceous Arundel Formation of Muirkirk, Prince George's County, Maryland, USA and the Potomac Group, also located in Maryland.