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Showing results for tags 'lamniform'.
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Hello everyone, I was wondering what the Maximum size for a late Cretaceous Cretalamna was? I have this tooth from Mississippi which clocks in at 1 29/32” (with root chipping), and can’t find much information as to the largest size that the genus reached in the Cretaceous.
This tooth was collected in the Sharktooth Hill Bonebed by Bob Ernst back around 1994-1995. At the time he and I thought it was a weird Parotodus because it appears to have a bourlette. The form wasn't really a good match otherwise. It's just over 1 7/8 inches along the slant and about 3/8 inches in labiolingual thickness. The cutting edges are underrated with no hint of lateral cusplets The tip is chipped but it doesn't appear to have been damaged when it was collected. Now, I think it's the giant thresher, Alopias grandis, but seems irregular for that as it basal outline of the root isn't a broader U-shape - maybe a jaw position variation or a regional variation. The apparent bourlette could be just the way some of the enameloid wore off. I don't think I've seen another tooth like this one from the STH Bonebed - thought the forum might want to see something oddball. I was inspired by that weird spiny thing that Marco posted a photo of. Jess
Here's an oddball tooth from the STH Bonebed. It is something I bought a few years after starting to collect fossil shark teeth, thinking it was a typical Parotodus lateral. After seeing others over the years, this tooth began to look more strange to me. Maybe 5-6 years ago, isurus90064 and I met up in Bakersfield and I showed him this tooth and he thought it was weird too. A couple of weeks ago, we started talking about it again. A friend just took a couple of good photos of it for me. The root isn't as thick as we might expect for Parotodus but some Miocene and older specimens are not as bulky-looking as the Pliocene teeth.