I was able to tame a Lv.60 Pulmonoscorpius in the Lava cave but the entrance was too small to bring them out; however, if you have an Argentavis you can grab them from the entryway and pull them out. Work for me.
This creature is either your best friend or your worst enemy. I recommend hammering speed, damage, and health. If tamed, it is a great early swimmer and good at helping tame other creatures. It doesn't make much noise so it can easily sneak up on you. Run away and shoot with tranq arrows. If you get stuck in it due to jumping or lag. Well. You can kiss you're butt good bye.