From the Super Mario Wiki
Yurarin Boo are fire breathing seahorse-like dragons found in the Muda Kingdom in Super Mario Land. Unlike their slightly smaller cousins, the Yurarin, the Yurarin Boo can move up and down shooting fireballs. On rare occasions, Yurarin Boos can also be found outside of the water. They are also known to be invincible to superballs. To defeat one, Mario had to jump on one's head or shoot it with two of the Marine Pop's torpedoes. Defeating one awarded Mario with 400 points. Interestingly, Yurarin Boo were more common than Yurarins, even though Yurarin Boos are stronger. They appear in all levels of the Muda Kingdom. They are under the assumed leadership of Dragonzamasu, who is possibly an even larger version of a Yurarin Boo.
Official artwork of a Yurarin Boo
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An in-game sprite of a Yurarin Boo
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A Yurarin Boo spitting fire
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