Talk:Rockgrub/@comment-35507650-20180506120315/@comment-28450065-20180507022443

Gonna be honest and say the story writer isn’t the best biologist.

The Boneshark is also described as having an exoskeleton so do you believe that is an invertebrate?

The Reefback is an invertebrate and due to the scarcity of invertebrates on 4546B the PDA mentions this, but no such mention is made in the Sand Shark or Boneshark entries.

The shared skeletal traits of the Research Specimen Theta would lead me to believe that they are relatives, and the fact that Theta has an endoskeleton makes me think that a Sand Shark would also.

The Ancient Skeleton is also a creature with a large shell and an endoskeleton within, we know of two extinct predators on the planet - one of which is a suggested Sand Shark relative - that possess both an internal and external skeleton, I see no reason that the Sand Shark should be any different.