Real FOSSIL MOSASAUR TOOTH - Excellent Fossil - Creataceous Period (65 Million Years+) - FOSSIL DINOSAUR TOOTH - Great Gift Idea

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Johan Lindgren; Hani F. Kaddumi; Michael J. Polcyn (2013). "Soft tissue preservation in a fossil marine lizard with a bilobed tail fin". Nature Communications. 4 (2423): 2423. Bibcode: 2013NatCo...4.2423L. doi: 10.1038/ncomms3423. PMID 24022259. The dentition was thecodont (tooth roots deeply cemented within the jaw bone). Teeth were constantly shed through a process where the replacement tooth developed within the root of the original tooth and then pushed it out of the jaw. [65] Chemical studies conducted on a M. hoffmannii maxillary tooth measured an average rate of deposition of odontoblasts, the cells responsible for the formation of dentin, at 10.9 micrometers (0.00043in) per day. This was by observing the von Ebner lines, incremental marks in dentin that form daily. It was approximated that it took the odontoblasts 511 days and dentin 233 days to develop to the extent observed in the tooth. [h] [66] Postcranial skeleton [ edit ] Well-preserved fossil of M. missouriensis Hands measure the jaw and teeth of the mosasaur skull with calipers. ZIETLOW holds a small scanner that flashes white light at the smaller mosasaur fossil. Mosasaurs were huge marine reptiles that lived in the Late Cretaceous, alongside dinosaurs–but they were not dinosaurs themselves. a b David B. Kemp; Stuart A. Robinson; J. Alistair Crame; Jane E. Francis; Jon Ineson; Rowan J. Whittle; Vanessa Bowman; Charlotte O'Brien (2014). "A cool temperate climate on the Antarctic Peninsula through the latest Cretaceous to early Paleogene". Geology. 42 (7): 583–586. Bibcode: 2014Geo....42..583K. doi: 10.1130/g35512.1.

MENG JIN appears on screen, speaking to camera. Text appears: “Meng Jin, Curator, Division of Paleontology”.Many of the earliest fossils of Mosasaurus were found in Campanian stage deposits in North America, including the Western Interior Seaway, an inland sea which once flowed through what is now the central United States and Canada, and connected the Arctic Ocean to the modern-day Gulf of Mexico. The region was shallow for a seaway, reaching a maximum depth of about 800–900 meters (2,600–3,000ft). [108] Extensive drainage from the neighboring continents, Appalachia and Laramidia, brought in vast amounts of sediment. Together with the formation of a nutrient-rich deepwater mass from the mixing of continental freshwater, Arctic waters from the north, and warmer saline Tethyan waters from the south, this created a warm and productive seaway that supported a rich diversity of marine life. [109] [110] [111] The authors of the study predict that in a very diverse ecosystem, it may take decades to find all of the rare species.

Cynthia G. Fisher; Michael A. Arthur (2002). "Water mass characteristics in the Cenomanian US Western Interior seaway as indicated by stable isotopes of calcareous organisms". Palaeogeography, Palaeoclimatology, Palaeoecology. 188 (3–4): 89–213. Bibcode: 2002PPP...188..189F. doi: 10.1016/S0031-0182(02)00552-7. The unique teeth suggest a specialized feeding strategy, or a specialized diet, but it remains unclear just what Stelladens ate. a b c d Florence Pieters; Peggy G. W. Rompen; John W. M. Jagt; Nathalie Bardet (2012). "A new look at Faujas de Saint-Fond's fantastic story on the provenance and acquisition of the type specimen of Mosasaurus hoffmanni MANTELL, 1829". Bulletin de la Société Géologique de France. 183 (1): 55–65. doi: 10.2113/gssgfbull.183.1.55. M. lemonnieri is a controversial taxon, and there is debate on whether it is a distinct species or not. [37] In 1967, Dale Russell argued that M. lemonnieri and M. conodon are the same species and designated the former as a junior synonym per the principle of priority. [38] In a 2000 study, Lingham-Soliar refuted this based on a comprehensive study of existing M. lemonnieri specimens, [36] which was corroborated by a study on the M. conodon skull by Takehito Ikejiri and Spencer G. Lucas in 2014. [11] In 2004, Eric Mulder, Dirk Cornelissen, and Louis Verding suggested M. lemonnieri could be a juvenile form of M. hoffmannii based on the argument that significant differences could be explained by age-based variation. [39] However, the need for more research to confirm any hypotheses of synonymy was expressed. [40] Because the genus Mosasaurus was not coined at the time, the original identifier, Samuel L. Mitchill, described the fossil as a lizard monster or saurian animal resembling the famous fossil reptile of Maestricht [ sic]." [25] Cuvier doubted whether the two specimens were related. The congeneric relationship was eventually confirmed by James Ellsworth De Kay in 1830, [25] and the New Jersey fossil was named Mosasaurus dekayi in his honor. [26] The taxon was declared a nomen dubium in 2005, [2] and other fossils attributed to it were reidentified as M. hoffmannii. [27]Camera focuses on a single large mosasaur tooth. ZIETLOW holds aloft a big fossil mosasaur tooth and indicates its shape. Main article: Research history of Mosasaurus §History of taxonomy Fossil skull of the proposed new species 'M. glycys '

The number of caudal vertebrae is not fully certain for M. conodon and M. hoffmannii. At least ten have been documented in M. conodon, while the count is completely unknown in M. hoffmannii. [11] a b Pablo Gonzalez Ruiz; Marta S. Fernandez; Marianella Talevi; Juan M. Leardi; Marcelo A. Reguero (2019). "A new Plotosaurini mosasaur skull from the upper Maastrichtian of Antarctica. Plotosaurini paleogeographic occurrences". Cretaceous Research. 103 (2019): 104166. Bibcode: 2019CrRes.10304166G. doi: 10.1016/j.cretres.2019.06.012. hdl: 11336/125124. S2CID 198418273. According to Philip J. Currie Dinosaur Museum, the movie mosasaur's movement is also inaccurate, based on a dated interpretation of Mosasaurus swimming like eels or snakes. a b Theagarten Lingham-Soliar (2004). "Palaeopathology and injury in the extinct mosasaurs (Lepidosauromorpha, Squamata) and implications for modern reptiles" (PDF). Lethaia. 37 (3): 255–262. doi: 10.1080/00241160410006519. Erle G. Kauffman (2004). "Mosasaur Predation on Upper Cretaceous Nautiloids and Ammonites from the United States Pacific Coast" (PDF). PALAIOS. 19 (1): 96–100. Bibcode: 2004Palai..19...96K. doi: 10.1669/0883-1351(2004)019<0096:MPOUCN>2.0.CO;2. S2CID 130690035.maximus- hoffmannii was the wording used in Russell (1967); this is in recognition of the belief of a close relationship between the two species. [38]