Mud Wheel is a Nautilus. It appears in Darius Burst
Taken from the famitsu.com on Darius Burst
A Belsar Flagship in the shape of a Nautilus. After a suprise attack by Planet Vadis, this ship was made to be the head of the conquered planet Darius. The ship has a body with high strength and wrapped in heavy armor. It is able to attack in many directions at once. Most of the armor sections are built with another turret. The burst gun is built into the central plane.
Gameplay
Gallery
As seen in Darius Burst in Zone ?