Given that there are a lot of elements to the creature I wanted to reduce the armature down to as few controller bones as possible so that it is easy to animate but still fluid and believable. To achieve this everything was an IK chain with limited rotations on each bone. To be honest I am surprised how well this rig functions given the apparent complexity yet very few controllers.
Good weight painting for deformations
Got to crease like flesh
Limits on the joint rotations
Was tricky to rig this while keep the teeth attached
COG/Root bone to move the entire model
Few controllers but a lot of control