Named after the dreaded whirlpool of ancient Greece, these marine monsters are truly the kings of the warm coasts of Io. They are extremely aggressive, and have been known to attack creatures much larger than themselves when provoked. They possess massive jaws with unparalleled strength, commonly crushing their prey with a single bite. Their self-sharpening teeth are not separate as they first appear, but are rather fused onto the skull and jawbone.
Though they spend most of their time in the water, they can move quite quickly on land, and will eat any small prey they happen upon. They have ravenous appetites, and have been known to gorge themselves to death when food is plentiful.