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I purchased these as Ingenia yanshini which I think became Ajancingenia, which then became and is currently Heyuannia. The formation provided is the Djadochta Formation, but that doesn't seem right since Ingenia/Heyuannia is not found there as far as I've checked. Unfortunately, there isn't provenance other than Mongolia attached to them to say whether they come from the Barun Goyot Formation where Heyuannia yanshini is found. While I'm not necessarily doubting the original ID, I just don't really know. I'm not expecting a positive or diagnostic ID to the genus level, but I wanted to at least know whether or not I can label this to Oviraptoridae indet., possibly Heyuanniinae indet. The original ID is a bit of an odd one, but it might have just been one of the few oviraptorids described at the time. Last I checked, there are now tons of recently described oviraptorid genera in Mongolia and China. The pair of phalanges with supposedly the semilunate carpal attached which I think is the smaller section? I know one of them did have glue in-between them when I lightly smeared it with acetone using a cotton swab. They are associated coming from the same sandstone block, apparently along with other shattered phalanges. Although I don't know if these actually came from the same animal since one looks ever so slightly larger. There is some sort of clump of sand or crystalized piece attached, as well as light beige or cream colored matrix. Not sure if that narrows down a formation, probably not, but I do see a lot of matrix from Mongolia tend to be red-ish color similar to the Kem Kem Beds. Any input is appreciated. There's probably a lesson to be learned here . . .

I’m planning on trading for this tooth but before I do I wanted to make sure if there’s any restoration or repair on the tooth. The tooth is labeled as Zhuchengtyrannus cf. and is from the 75-71 million year old Djadochta Formation of Southern Mongolia. Though I think it’s safer to call it Tyrannosaurid indet. at the moment as the species or any Tyrannosaur species hasn’t been formally described from the formation.

Hi all, I had posted about this tooth years ago and the conclusion back then was that its preservation was too poor for any proper ID. I am hoping that with new information we can at least determine if this is a crocodile or theropod. I discovered today that this tooth preserved some serrations First up, this tooth was acquired from a source with many Mongolian material. He called this an Alioramus tooth but I am not comfortable calling it that yet Secondly, a museum curator (who has handled Mongolian material) examined this tooth in person. He concluded this tooth was indeed Mongolian but he could only say it's a carnivore. Unfortunately, we are unable to determine which part of Mongolia it came from. The crown is 40 mm in a straight line. I have quite a number of croc and theropod teeth and this tooth feels much closer to a theropod than a crocodile both in terms of morphology and size. However, I am not unbiased in my ID, and the shallow jaw fragment is throwing me off. Assuming this is indeed from a tyrannosaur, I'd expect the jaw to be much deeper. Please let me know your honest thoughts, thank you Comparison of tooth to a cf. Daspletosaurus from the Judith River Formation