Sharkseal

Sharkseal (シャークシール) is the shark-like enemy Mechaniloid in Mega Man Zero that appears in the Secret Base after Blizzack Staggroff's defeat. They only swim left and right.

Sharkseal X
Sharkseal X is a red Sharkseal that appears in Mega Man Zero 3. It pursues ZeroXorZ in the Oceanic Highway Ruins, Frontline Ice Base, and Sunken Library.

Leviathan's minigame
A Sharkseal variety appears in Fairy Leviathan's minigame from Mega Man Zero 3. These Mechaniloids simply swins straight forward and can be destroyed by Leviathan with a single hit, increasing the time limit. In the minigame's artwork they are green, but in the minigame they are purple.