The Lost River Fossil

ChaosKnight626

I wonder if we'll come across whatever creature has that for a skeleton. That would be amazing to see.

BIPPITY

http://unknownworlds.com/subnautica/files/2015/09/20150927_SN_LostRiver_Large.jpg
you should probably link an image so people know what you are talking about.

TerraBlade

From what I can see in the picture, the fish swimming through the mouth is either a baby or the decedent of the larger skeleton.