Wyverns found only in the Desert. They resemble a Plesioth, but live and "swim" in sand rather than water. They seldom appear above land, but when their hearing is disturbed...
Order:Ichthyosauria - Suborder:Fish Feet Wyvern - Superfamily:Sand Wyvern - Family:Cephalos
The Cephalos is perfectly adapted to living in the desert, so as a result would find it impossible to live anywhere else.
The Cephalos is completely adapted to living in the sand and as a result would find it simply impossible to live anywhere else, its body has adapted to be incredibly streamlined and slick, allowing it to push, or 'swim' through the sand incredibly quickly.
They are also known for being able to fire a small stream or lump of sand. It is most likely just simply gathering some sand in its mouth, mixing it with some saliva to help it stick together then firing it off at high speed. This would be used to deter larger monsters, such as a Diablos or just to kill prey and any unwitting hunters.
They have extremely sensitive hearing, to pinpoint prey while under the sand. However, their excellent hearing can be used against them, as you can easily scare them out of the sand by using a sonic bomb. Creatures' roars can also shock them out of the sand, most noticeably with Diablos and Monoblos.
The true color of a Cephalos is Blue or rare Purple but over time sand sticks to there body covering the blue coloration.
Cephalos are known for gathering in packs and hunt along side there leaders Cephadrome they ambush and surround their prey as they swim through the sand.