Talk:Rockgrub/@comment-35507650-20180506120315/@comment-28450065-20180506150617

The dead creature that is a relative of the Sand Shark in the disease research facility possesses both a hard external shell and a spine and ribcage within the Shell. We can assume the Sand Shark is the same.

Think of a dunkleosteus but with the hard plating covering the entire body rather than just the head.