Pliosaurus or Plesiosaurus

[MiseriKing]

Hello. My qestion - pliosaurus or plesiosaurus?

Fossil from Russia Cretaceous (Cenomanian stage), Tambov and Ryazan region

[Natalie81]

Nice teeth! 

I'm leaning towards Pliosauroidea(for the 2nd one) , but want to see what others say

 

[Anomotodon]

First one is a fish similar to Pachyrhizodus. Second one is most likely a plesiosauroid, possibly Leptocleidid.

[Natalie81]

3 hours ago, Anomotodon said:

First one is a fish similar to Pachyrhizodus. Second one is most likely a plesiosauroid, possibly Leptocleidid.

You might be wright with the first tooth. About the 2nd tooth,  isn't it so that Leptocleidid lived during early cretaceous? I doubted plesiosaur for the grooves... 

[Anomotodon]

1 hour ago, Natalie81 said:

You might be wright with the first tooth. About the 2nd tooth,  isn't it so that Leptocleidid lived during early cretaceous? I doubted plesiosaur for the grooves... 

 

Leptocleidus is a genus that lived in Early Cretaceous, right, but I am talking about a larger clade Leptocleidia that includes families Leptocleididae and Polycotylidae. Their teeth have enamel folds, look at these teeth from a polycotylid Dolichorhynchops

 

[Natalie81]

5 minutes ago, Anomotodon said:

 

Leptocleidus is a genus that lived in Early Cretaceous, right, but I am talking about a larger clade Leptocleidia that includes families Leptocleididae and Polycotylidae. Their teeth have enamel folds, look at these teeth from a polycotylid Dolichorhynchops

 

Thank you very much for the info!