(oh,but were is Prionosuchus, a little hard to find something here )
lion's mane jelly
It seems like the giant megalodon could have exceeded 18 m but for now this seems fine.
You should replace a Kronosaurus-like model instead of Pliosaurus. It is possible that Pliosaurus macromerus was not reaching 13 m and was about the size of Kronosaurus at 10-11 m. However, I suggest you to replace it with a kronosaur-like model because it seems that the Monster of Aramberri, a not yet named Mexican pliosaur, is related to kronosaurs and being between 12 and 14 m. In other words, this pliosaur, related to kronosaurs, is the most likely largest pliosaur to date.
I'm no amateur arguing without knowing, I can give you scientific ref. for this, the one about the pliosaur is very recent.
I merely read hints that this specimen was related to Kronosaurus, but that doesn’t imply similar body shape.
Kronosaurus has relatively short paddles compared to Pliosaurids. On the other hand, the femoral head of UANL-FCT-R2 gave an estimate of 15m based on an immature Liopleurodon specimen, so the flippers must be very big relative to its size.
"the small dimension of the flippers with respect to the body size, hint a kronosaurid affinity of the Aramberri pliosaur"
It had at least kronosaurid-like flippers. So the image here likely does not correspond to that pliosaur.