Yes, thank you for posting this excellent images Kat. No matter how many times one sees images of Messie and it's anatomical details, one never ceases to be amazed at quite how stunning and fascinating the animal is.
Here is the Animal Face-Off model underwater to compliment Kat's images above.
That's a short segment from it for sure, and yes, Mesonychoteuthis. I think you'll find an edited version of that AFO episode being produced shortly, but it will not be a part of the AFO series itself. (Something new, better.) It never has aired in the US.