Possible Plesiosaur/Pliosaur Tooth from UK

[Alston Gee]

Both of the teeth came from the White Limestone, Traditional Layer, Great Oolite Series, Bathonian of Oxfordshire, UK. Any thoughts on the identity of these teeth? Are they crocodile teeth or plesiosaur/pliosaur teeth?

Edited September 6, 2022 by Alston Gee
add img.

[Alston Gee]

@pachy-pleuro-whatnot-odon

[pachy-pleuro-whatnot-odon]

I've previously identified both of these as teleosaurid crocodile teeth for the fact that the teeth have carinae, which don't occur on plesiosaur teeth.

[fossils-uk]

Croc 

[Mart1980]

I agree with teleosaurid.

[Alston Gee]

Here is a tooth from Goulmima, Morocco. The tooth could either be polycotylid plesiosaur or Brachauchenius lucasi. What’s your thoughts on it? @pachy-pleuro-whatnot-odon

[Alston Gee]

2 minutes ago, Alston Gee said:

Here is a tooth from Goulmima, Morocco. The tooth could either be polycotylid plesiosaur or Brachauchenius lucasi. What’s your thoughts on it? @pachy-pleuro-whatnot-odon

This tooth is labeled as “Manemergus anguirostris”, but I can’t find adequate  information about this species.

[pachy-pleuro-whatnot-odon]

Have a look at the below post, in which I illustrate the visual differences between the three types of plesiosaur teeth found in the Akrabou Formation - that is, brachauchenine pliosaur (Brachauchenius lucasi is an exclusively US-based species), the elasmosaur Libonectes atlasense, and polycotylid (both Manemergus anguirostris and Thililua longicollis):

 

 

The tooth you present here is a bit tricky to identify due to the state it's in, as you'd use presence/absence of carinae and the nature of the striae to arrive at an ID. However, since the visible striations don't run the full length of the tooth - which they typically do in Moroccan brachauchenine pliosaurs - and the tooth is, moreover, more heavily compressed than most pliosaur teeth are, I'd say this is a polycotylid teeth. That having been said, I myself have also not yet been able to figure out how to differentiate between the teeth of Thililua longicollis and Manemergus anguirostris. So "polycotylidae indet." it will need to remain...

[Alston Gee]

Thanks, the link you provided is really helpful.