This guy is a head lizard and a giganotosauras body their skin is magma charcoal
Magmasaur
The Magmasaur is a large creature that can swim in lava. Its saddle is fire resistant.

More Magmasaur Encountering Tips
Guys this thingβs fire attack has been buffed. IT CAN NOW DESTROY TEK!
Beware of these guys!
This creature can damage stone with fireball attack! Be aware new survivors!!
I found the cave on lost island for magma eggs. GPS 23.0, 64.0
Lunar North on N are where most of the green rocks to feed your baby magmasaur
On the new lost island map they are found in a cave at the top of the map in the volcano, the babies can be fed Sulfur rather than ambergris to stay alive
Who thinks they should be in scorched earth (aka ur gonna die)
If it finds you, RUN. if you find it, RUN.
If you spawn in the hardest area of fjodur these things will be everywhere along with alpha rex, Raptors, Carnos and Basilks and megalanias and wyverns
When spitting on metal spikes it damages it self with its own attack
If you get too close to a wild one that used it's special ability (a charge that will set it on fire and aggravate nearby dinos) it'll display a message saying "getting hot! Stay away!!!!" and that will set you on fire. Don't approach unless you know you're prepared.