Jellyfish

Jellyfish are a species of underwater creatures that have appeared in Yoshi's Story and Super Mario Galaxy series .

Yoshi's Story
They only appear in one level as an enemy.

Mario & Wario
Mario and Wario use one of these creatures in a level.

Donkey Kong Jungle Beat
They appear as enemies but resemble real-life ones.

Super Mario Galaxy series
They appear as enemies.