These are Hallucigenia. You can be Damaged with Those Thing. You can interact it with Water Bucket to make it Breathable Out of Water.
Not Obtainable
These are Armadillosuchus. You can Tame Both of its Baby and Adult. You can Brush The Adult to get a Scute.
These are Nyctosaurus. They will Flee from Players and Other Mobs. You can Transport its Baby with Bowl