Pretty fancy design, I know.

Tamao was the guardian of Dragonzamasu, the ruler of the Yurarin race as well as the rest of the Muda Kingdom of Sarasaland during the events of Super Mario Land for the Gameboy. Being the guardian of Dragonzamasu, it only appeared in Level 2-3, the Marine Pop level, where only one existed. This one appeared to be a large bubble, and was completely indestructible, meaning Mario needed to simply dodge it and aim for the huge Yurarin it protected instead. After Dragonzamasu's defeat, Tamao dissipated, never to be seen again.

File:Tamaoart.jpg
Strangley, official art has been found for the creature

It has been rumored that Tamao was a sub-species of underwater Podoboo. However, it has also been rumored that Tamao was nothing more than a magical spell used by Dragonzamasu to protect himself.