A.Totally eyeless, so it was probably a bottom feeder.
May have hunted food via sonar.
B. Vestigal fins.
C. A large heavily boned head with a domed forehead. Good for burrowing down.
D. Few predators to worry about.
E. A fast swimmer with a very strong body.
F. Something between a Dolphin and a reptile is one guess.
If it is indeed totally eyeless then it’s no tusky eel or fang tooth snake eel
They have eyes