I need help identifying these sauropod teeth from Yixian Formation

[-Andy-]

Hi all, I have several sauropod teeth from the Yixian Formation of Liaoning that I need help identifying.

 

 

This is Tooth 1 - White

 

Length: 44 mm

Formation: Jianshangou Beds of Yixian Formation

Locality: Chaomidianzi, Sihetun, Beipiao, Liaoning Province

 

I believe this is a Dongbeititan dongi tooth as this tooth has the morphology of titanosauriform teeth, and Dongbeititan is the only titanosauriform from that locality as far as I know. The formation is based off the locality of Chaomidianzi (my source was confident of that locality)

 

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This is Tooth 2 - Red

 

Formation: Lujiatun Bed of Yixian Formation

Locality: Yanzigou, Shangyuan, Beipiao, Liaoning

 

I believe this is a cf. Euhelops sp. tooth as this tooth has the morphology of titanosauriform teeth, and cf. Euhelops sp. is the only titanosauriform from that locality as far as I know. The formation is based off the locality of Yanzigou and the red matrix. I've compared this matrix to multiple Yanzigou locality fossils of the Lujiatun Beds and they are identical

 

 

My ID is based off this paper "Basal titanosauriform (Dinosauria, Sauropoda) teeth from the Lower Cretaceous Yixian Formation of Liaoning Province, China"

 

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This is Tooth 3 - Partial

 

Formation: Lujiatun Bed of Yixian Formation

Locality: Yanzigou, Shangyuan, Beipiao, Liaoning

 

I believe this is a cf. Euhelops sp. tooth as this tooth has the morphology of titanosauriform teeth, and cf. Euhelops sp. is the only titanosauriform from that locality as far as I know. The formation and locality is based off the red matrix in the cross section. This tooth was resold from my source but he confirms it's definitely within Beipiao and either from Yanzigou or Sihetun. I've compared this matrix to multiple Yanzigou locality fossils of the Lujiatun Beds and they are identical

 

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This is Tooth 4 - Tiny

 

Formation: Yixian Formation

Locality: Sihetun, Beipiao, Liaoning

 

This is the toughest tooth of all due to its size and incompleteness. It's the top half of a spoon-shaped crown. Again, the source admits being a reseller but he promises the locality is accurate. I believe this is a Titanosauriform indet. I showed this tooth to @hxmendoza and he agrees it's a tooth, not a claw. The closest match I can find to this tooth is MSNM V6214 from "Sauropod teeth from the Middle Jurassic of Madagascar, and the oldest record of Titanosauriformes"

 

 

May I have your thoughts on these IDs please? Thank you.