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The fact that so many fossils of Ptychodus have been found in different regions of the world provides evidence of a distribution of species during the Albian-Turonian time. [6] The generic name Ptychodus comes from the Greek words ptychos (fold/layer) and odon (tooth), so "fold teeth" describing the shape of their crushing and grinding teeth. [11]
Identification of most sharks are found through a combination of tooth counts and tooth shapes. Teeth can even lead to the identification of shark species like the requiem shark. The fossilized records of teeth helps illustrate evolutionary history, and isolated teeth are used to study and analyze specific linear measurements of the species. [21]
In 2007, Peter Galton, reviewing the archosaurian fossils of the 1834 Bristol finds, reaffirmed the identification of the two teeth and humeri of Palaeosaurus platyodon (Rileya) as belonging to a phytosaur, and regarded P. cylindrodon (Palaeosauriscus) as an indeterminate archosaur.
The teeth-like fossils of the conodont were first discovered by Heinz Christian Pander and the results published in Saint Petersburg, Russia, in 1856. [2]It was only in the early 1980s that the first fossil evidence of the rest of the animal was found (see below).
Metabolic disorders resulting from poor diet or disease have a particularly significant effect on enamel, and a range of other non-specific diseases can cause the feature, such as measles, diphtheria and deficiency in vitamin A, D and C. [24] The identification of enamel hypoplasias is best done with microscopic analysis of tooth thin sections ...
Some of the most important anatomical information about dinosaur teeth is collected from polished, microscopically thin sections , including the types of dental tissues present, tooth wear, tooth replacement patterns, how the teeth are attached, and the frequency of replacement. The actual material comprising a dinosaur tooth is not very ...
Palmetto Fossil Excursions, located about 25 miles northwest of Charleston, reported the dual discoveries in a Nov. 3 Facebook post, and included photos of the large, rust-colored tooth.
Its teeth, which are found worldwide, are often prized by fossil collectors due to their rarity. The scarcity of fossils is because Parotodus likely primarily inhabited open oceans far away from the continents. While the placement of Parotodus with the Lamniformes has been debated, most researchers agree it was probably a member of a now ...
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