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Showing results for tags 'hubbell white shark'.
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From the album: Sharks
White sharks used to have smooth-edged teeth. They eventually evolved serrations as their diets transitioned to marine mammals from fish. This shark was a transitional form between the smooth-edged predecessors and the modern fully-serrated great white. The serrations on this tooth are not worn-down. C. hubbelli serrations are naturally finer, typically decrease in size towards the tip, and are oriented towards the tip. This tooth is from the desert of northern Chile. Fossils from Chile are now illegal to export, so as an ethical collector you need to make sure that any Chilean fossils you are interested in were exported prior to the ban.-
- bahia inglesa
- caldera basin
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Identification Teeth of C. hubbelli are morphological intermediates between C. hastalis and the extant species C. carcharias. They all possess erect triangular cusps, no nutrient groove, and a thin to no lingual dental band ("bourlette"). C. hubbelli exhibits transitional serrations which are finer/weaker than those of the extant species, and diminish in size apically.1 This feature may be confounded with the same pattern in nascent C. carcharias.2 C. hubbelli may be confused with C. subserratus (escheri), however they can be easily distinguished by their geographic distributions. C. hubbelli is exclusively found in the Pacific, while C. subserratus (escheri) is only found in the Northern Atlantic and Mediterranean.1 References 1. Ehret, D.J., Macfadden, B.J., Jones, D.S., DeVries, T.J., Foster, D.A. and Salas-Gismondi, R. (2012), Origin of the white shark Carcharodon (Lamniformes: Lamnidae) based on recalibration of the Upper Neogene Pisco Formation of Peru. Palaeontology, 55: 1139-1153. https://doi.org/10.1111/j.1475-4983.2012.01201.x 2. Hubbell G. (1996), Using tooth structure to determine the evolutionary history of the white shark. In: Klimley AP, Ainley DG, editors. Great White Sharks: The Biology of Carcharodon carcharias. San Diego: Academic Press. pp 9–18.
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- carcharodon
- carcharodon hubbelli
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