2011

• Colour scheme based on the Mosasaurus model made by Harper Collins under critters pixel shack, depicted as a blue serpentine-like reptile with yellow eyes.
• Head
• Main Terrorpin mouth with a Shortensnout hidden within to serve as second set of teeth
• Saurian eyes with Heycorn detail parts as the pupils
  
• Sporacles nostrils
  
• Body
• Finneas fin detail parts as the creature's flippers
  
• Long tail with a pair of sail-like Icky-osaur parts at the end

2016

• 2011's colour scheme remade with a lighter bluish grey base and a darker blue back
• Head (bigger than previous version)
• CrocKisser mouth (no extra mouth within)
  
• Fawninatrix antler weapon part hidden within to give a higher charge level
• Keratinhorn weapon parts for the teeth
• Knurl Down detail parts for covering head detail, only exposing the ends of the mouth
• Felizard eyes
• Body
• Adjusted to resemble closely to skeletal reconstruction of the animal
• Finneas fin detail parts retained as the flippers
  
• Tail updated based on recent paleontology depictions which have a paddle-like fluke at the end of the tail; used a short limb and Knurl Down rotated sideways to overlap one another to create it

https://www.deviantart.com/edmundpjc/art/Mosasaurus-Spore-Model-Timeline-854551920