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Hi everyone, I found this really weird fossil from a fossil tooth display set of prehistoric fish and reptiles that I bought from the National Maritime Museum of China. It says that it belongs to Cretalamna appendiculata, but I searched it online and found out that the teeth of Cretalamna appendiculata looked really unlike what I have. Does anyone know which creature does this piece of fossil belong to? P.S. The display set says that all the fossils are from the phosphate mines of Morocco Picture one is the piece of fossil that needs identification Picture two are tooth fossils of Cretalamna appendiculata

I've been wondering how large teeth from Cretalamna appendiculata-type sharks could get. In their examination/further classification of these sharks, Siversson et al. depict several teeth that are a good deal larger than an inch/25.4 mm, including a first upper anterior of C. borealis that they note may have originally reached 38-40 mm in height (though with a broken tip is shorter than that now). From a marketplace perspective, C. appendiculata type teeth measuring an inch or larger appear somewhat uncommon, though they pop up from time to time. My question for shark teeth experts and collectors on the forum is what's the largest C. appendiculata-type tooth that you know of? Please post photos of any larger teeth in your collections as well. Below are a few large U.S. teeth that I've acquired. From left to right, they are: (1-3) 28.6 mm, 26.3 mm, and 28.0 mm from the Campanian of Russell County, Alabama; (4) 27.9 mm from the Santonian-Campanian of northeast Mississippi; and (5) 28.0 mm from the Maastrichtian of Conway, South Carolina. The tooth on the left would have been even bigger with the tip intact of course!

Hi, just a recap of my situation: I live in south of Japan in a city called Kumamoto and I prospect mainly for fossil shell the Himenoura formation which is an upper cretaceous (santonian) marine deposit formation. Even if I know that a lot of shark teeth were found at my usual spot, I never looked for it until my Super Secret Santa send me some superb cosmopolitodus Hastalli tooth and I caught shark tooth virus. Since then, I looked more carefully to this little beauty and found some. As my knowledge in shark tooth is still pretty limited, I ask to a japanese friend of mine who's more into teeth and who told me that the tooth I found was lamna's one. here is the picture of my the one I found. however I have some question about these tooth. As I was looking for information concerning cretalamna in order to determine the place of the tooth I noticed that all cretalamna tooth had cusp. Like this picture from an old post: http://www.thefossilforum.com/uploads/monthly_07_2015/post-3940-0-35234500-1436898635.jpg Did I misidentified the tooth or is there some cretalamna sub species which would have tooth without cusps ? Thank you very much for your help and I hope taht this post will help for futur lamna's teeth identification. David