Using Shonisaurus sikanniensis as a model, the researchers estimated the ichthyosaur to have been  long, nearly the size of a blue whale. Scaling based on Besanosaurus, however, found a shorter length estimate of .
Using Shonisaurus sikanniensis as a basis, the researchers estimated the ichthyosaur's length to be exceptionally long, similar in magnitude to that of a blue whale. In contrast, using Besanosaurus as a reference yielded a shorter length estimate of .