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Showing results for tags 'cetorhinus'.
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I have a few shark teeth that require second opinions on the IDs. All are East Coast of the US. First up, a Pungo River micro. 4mm or so. This is a familiar tooth form to me as I’ve seen this exact tooth in STH micros. I had put teeth of this exact form in with Cetorhinus teeth because it’s so common in STH micro mix. I could be wrong about the ID on the STH teeth plus Pungo River is different as I believe Cetorhinus teeth are quite rare in that fauna. Both STH and PR have Cetorhinus and Alopias teeth. I believe there is a close familial relationship between those genera so I figured best to get other opinions before labeling this a Basking Shark. I had a very, very small amount of Lee Creek micros to pick through, like half a sandwich bag. The odds of finding a Cetorhinus in that amount of matrix would be astronomical lol It’s probably why I doubt my ID. @siteseer @sharkdoctor @Al Dente @sixgill pete Anyway, here it is. Cetorhinus or Alopias or door #3 ?
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- alopias
- calvert fm
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Rhincodon (Whale Shark) and Cetorhinus (Basking Shark) extant and fossil teeth
MarcoSr posted a topic in General Fossil Discussion
Rhincodon (Whale Shark) and Cetorhinus (Basking Shark) are both filter feeders. The extant species are Rhincodon typus and Cetorhinus maximus. Their teeth size is very small compared to body size (Rhincodon typus max size: 17 to 21 meters and Cetorhinus maximus max size: more than 10 meters, Ebert 2013). Below I show pictures of both extant teeth and fossil teeth. Both Rhincodon (Whale Shark) and Cetorhinus (Basking Shark) fossil teeth are very uncommon worldwide. However these teeth can be found regularly at two United States sites. Cetorhinus teeth are very common from the Miocene Round Mountain Silt Formation (Shark tooth Hill) in Bakersfield, California (Ernst Ranch). Rhincodon, although not really common, can be found regularly in the Miocene spoil piles from the Lee Creek Mine in Aurora North Carolina. I show pictures of teeth from both these sites below. Extant Rhincodon typus teeth: Small tooth section from a jaw (25 mm by 20 mm) Multiple views of two teeth (both 4 mm) Fossil Rhincodon teeth from the Lee Mine, Aurora NC: Three teeth (all 3.5 m) Extant Cetorhinus maximus teeth: Small tooth section from a jaw (20 cm by 3 cm) Multiple views of a single tooth (10 mm) (I have hundreds of fossil teeth from the Ernst Ranch with the largest being only around 7.5 mm). Fossil Cetorhinus huddlestoni teeth from the Ernst Ranch, Bakersfield CA: 5 teeth (6.5 mm, 6.5 mm, 5 mm, 7 mm & 6 mm) Note the cusplets on the below two teeth (both 3 mm). Cusplets are a feature of a number of juvenile tooth positions. The mesial cusplets are reduced or lost, although some are retained in adult teeth Welton 2014. Marco Sr.- 17 replies
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- cetorhinus
- extant and fossil teeth
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References: Sand pit "Trift" Hovestadt, D.C. & Hovestadt-Euler, M. (2012) A partial skeleton of Cetorhinus parvus Leriche, 1910 (Chondrichthyes, Cetorhinidae) from the Oligocene of Germany. Paläontol Z 86: 71. doi:10.1007/s12542-011-0118-9
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