Ad
related to: thecodontia teethen.usdentalservice.com has been visited by 100K+ users in the past month
Search results
Results from the WOW.Com Content Network
Thecodontia (meaning 'socket-teeth'), now considered an obsolete taxonomic grouping, was formerly used to describe a diverse "order" of early archosaurian reptiles that first appeared in the latest Permian period and flourished until the end of the Triassic period. All of them were built somewhat like crocodiles but with shorter skulls, more ...
Thecodont dentition is a morphological arrangement in which the base of the tooth is completely enclosed in a deep socket of bone, as seen in crocodilians, dinosaurs and mammals, and opposed to acrodont and pleurodont dentition seen in squamate reptiles. [1]
This did not change when Richard Owen coined the term Dinosauria in 1842, because Owen did not recognise Thecodontosaurus as a dinosaur; in 1865, he assigned it to the Thecodontia. It was not until 1870 that Thomas Huxley became the first person to understand that it was a dinosaur, though referring it incorrectly to the Scelidosauridae. [18]
This feature is responsible for the name "thecodont" (meaning "socket teeth"), [8] which early paleontologists applied to many Triassic archosaurs. [7] Additionally, non-muscular cheek and lip tissue appear in various forms throughout the clade, with all living archosaurs lacking non-muscular lips, unlike most non-avian saurischian dinosaurs. [ 9 ]
Within the alveoli, teeth are periodically replaced by new teeth growing beneath; shedding of the old tooth crown occurs after resorption of the root. The condition of having deep alveoli is known as thecodont , and is present throughout Archosauria , including dinosaurs.
The Stockton, New York, homeowner initially spotted two teeth hidden in the fronds of a plant on their property and proceeded to uncover two more teeth buried inches underground, the New York ...
The teeth are stout at the base, with slightly recurved and sharp points. [5] The first four to five maxillary teeth (anterior) are the largest at the primitive position of the canines. [5] [3] These teeth are moderately elongated, flattened, and present an obtuse apex. [3] The premaxillary and maxillary teeth are typical thecodont teeth. [8]
They also noted that von Huene (1942) assigned two more specimens from other localities to R. tiradentes: several isolated teeth, BSPG AS XXV 101 (the proximal end of an ulna) and BSPG AS XXV 102 (a partial metatarsal), [3] but these cannot be confidently assigned to R. tiradentes as no overlapping material is known.
Ad
related to: thecodontia teethen.usdentalservice.com has been visited by 100K+ users in the past month