Suborder Amphisbaenia is a group of peculiar legless squamates distantly related to lizards and snakes, in spite of their resemblance to worms (due to their pink color and scales arranged in rings). They are very poorly known, due to their burrowing lifestyle and general rarity. Only one species exists in the US, with most of them being in Africa and South America. Little is known of them outside of their anatomy, and even that is difficult to study due to the mechanics of dissecting something so small (most species are less than 6 inches long).
The head is stout, not set off from the neck, and either rounded, sloped, or sloped with a ridge down the middle. Most of the skull is solid bone, and they have a distinctive single median tooth in the upper jaw. They have no outer ears, and the eyes are deeply recessed and covered with skin and scales. The body is elongated, and the tail truncates in a manner that vaguely resembles the head. Their name is derived from Amphisbaena, a mythical serpent with a head at each end.
The skin of amphisbaenians is only loosely attached to the body, and they move using an accordion-like motion, in which the skin moves and the body seemingly just drags along behind it. Uniquely, they are also able to perform this motion in reverse, just as effectively.
Snakes, lizards and Amphisbaenia are closely related and belong to a single order, Squamata, with three suborders.
In spite of the theory regarding the evolution of modern snakes from burrowing lizards, there is no modern lizardfamily that could be construed to be a link between lizards and snakes.
Even the legless amphisbaenians (suborder Amphisbaenia), which were at one time thought to be lizards turning into snakes, have now been classified into their own suborder.
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