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Showing results for tags 'anacoracid'.
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From the album: Pawpaw Formation
Squalicorax baharijensis, Tarrant Co. Albian, Cretaceous Feb, 2023 Squalicroax baharijensis on the basis of broad neck and well developed serrations (?). Could be wrong with the serrations. If they are "poorly developed", S. pawpawensis would be the better ID.-
- albian
- anacoracid
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From the album: Austin Chalk
Squalicorax falcatus, DFW Coniacian, Cretaceous Feb, 2023 The biggest squali in my collection so far!- 1 comment
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- atco
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From the album: Ozan Formation
Squalicorax kaupi, Fannin Co. Campanian, Cretaceous Dec, 2021 A favorite of mine from the NSR!-
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- anacoracid
- crow shark
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This thread was inspired by Sander's excellent review of his collection of Squalicorax teeth. I have started getting some of my Squalicorax specimens together and a few have been photographed already to provide additional visual references for collectors. I will try to show teeth chronologically (Albian teeth first, then Cenomanian...) from early in the evolution of the genus and on to the time of its last representatives. I start with the two oldest Squalicorax teeth in my collection - a pair of specimens from the Upper Albian-age Pawpaw Formation, Motorola site, Tarrant County, Texas. The first tooth is S. pawpawensis (10mm along the mesial edge) and the second is S. priscoserratus (just over 10mm along the mesial edge).
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- anacoracidae
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Does anyone have a ballpark figure for the amount of time it takes one species to evolve into or diversify into another? I am working on a shark fauna that comes from the Coniacian, and one of the genera is only known from one species that was found in the Santonian (Scindocorax novimexicanus). This site is one to two million years older, and the species is definitely a part of the Scindocorax genus. This is only the second occurrence of this anocoracid reported from New Mexico, and although the teeth compare with that described from the Santonian, I'm wondering if the age difference would indicate a separate species. The Scindocorax novimexicanus photo is a lingual view of a left anterior tooth, while the Scindocorax sp. photo is a labial view of a left lateral tooth. Thanks!
- 22 replies
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- anacoracid
- coniacian
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