roller
The body of the animal rotates around its long axis as the animal moves, causing the animal to move in a circular pattern. In liquid media, wave propogation is helical rather than planar.
left handed roller
The body of the animal rotates around its long axis as the animal moves, causing the animal to move in a circular pattern in the left-handed direction. In liquid media, wave propogation is helical rather than planar.
right handed roller
The body of the animal rotates around its long axis as the animal moves, causing the animal to move in a circular pattern in the right-handed direction. In liquid media, wave propogation is helical rather than planar.