Moroccan Phosphate vetebrae id help Elasmosaur? Croc? Mosasaur?

[jikohr]

Hi everyone!

 

Fun story behind these. I bought them when I was about 15 labeled as "Mosasaur Vertebrae". As I've gotten older and (hopefully) more experienced I'm questioning that ID after pulling them out recently. All three are from the Moroccan Phosphates.

 

So what do you all think? I'm leaning towards croc on the third and Elasmosaur on the other two with a slight possibility of the first being really primitive whale, but I'm not sure.

Any insight is greatly appreciated as always!

 

Vertebra 1: 49.4 mm long, 52.36 mm tall, 36.54 mm and 34.8 mm wide. one centrum in concave the other is flat.

 

Vertebra 2: 49.6 mm long, 49.23 mm tall, 49.5 mm wide. both ends concave

 

Vertebra 3: 48 mm long, 39.9 mm tall, 34 and 32.75 mm wide. both ends slightly concave.

 

[hemipristis]

Plesiosaur, I believe, based upon shape and the dual concavity.

 

However there are others more attuned to reptiles, so I’d wait for their input for sure

[pachy-pleuro-whatnot-odon]

1. A dyrosaurid crocodile vertebra, which you can tell from the elongated vertebral face and the presence of a broken ventral process.
2. Probably dyrosaurid crocodile, as mosasaur vertebrae would be procoelous and plesiosaur vertebrae don't have processes projecting ventrally.
3. I think this is another dyrosaurid crocodile vertebra, as the vertebral faces are too elongate for either mosasaur or plesiosaur and ventral projection wouldn't match plesiosaur anyway. While it could be part of the peduncle of mosasaur cervical vertebrae, the amphicoelous centrum morphology doesn't match mosasaur.