Rhomaleosaurus tooth from southwestern China?

[Alston Gee]

I recently acquired three tooth fossils from southwestern China initially labeled as a "Plesiosaurus indet." tooth. The specific locality of the tooth fossils is the Lower Shaximiao Formation, Zigong, Sichuan, China.

 

The age of the Lower Shaximiao formation ranges from Early to Middle Jurassic. The only known plesiosaur species from the Shaximiao formation is Bishanopliosaurus zigongensis, a rhomaleosaurus. If these three tooth are indeed identified as a plesiosaur tooth, they probably belong to Bishanopliosaurus sp.

 

Can anyone help me to identify whether these teeth are plesiosaur teeth?

 

 

 

[Alston Gee]

@pachy-pleuro-whatnot-odon

[Alston Gee]

Here are three pictures of the Bishanopliosaur sp. teeth from Zigong Dinosaur Museum. 

[Alston Gee]

@pachy-pleuro-whatnot-odon Would you identify these teeth as plesiosaur?

[pachy-pleuro-whatnot-odon]

Sorry for arriving late to the party! It's been rather busy and it seems like the post afterwards slipped my mind. However, here are my thoughts on the teeth:

 

The first and third tooth are crocodile teeth, as they've got carinae, which plesiosaurs wouldn't have. See the images below as to where these are located, marked in red.

 

 

 

In contrast, the middle/second tooth is a bit trickier to identify, as there's no clear indication of a carina. However, seeing how the striae in the lower left side of it terminate before reaching the ridglet that overlies it - a trait seen in crocodile teeth, but not in plesiosaurian ones, where striations tend to merge - I suspect this is a crocodile tooth as well...