Squamata

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Sauria- Lizards

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Serpentes - Snakes

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Amphisbaenia - Worm lizards

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Squamata (scaled reptiles) is the largest recent order of reptiles, including lizards and snakes. Members of the order are distinguished by their skins, which bear horny scales or shields. They also possess movable quadrate bones, making it possible to move the upper jaw relative to the braincase. This is particularly visible in snakes, which are able to detach their jaws entirely to accommodate very large prey items. The male members of the group Squamata are the only vertebrates with a hemipenis. This is also the only reptile group where we can find both viviparous and ovoviviparous species, as well as the usual oviparous reptiles.

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Classically, the order is divided into three suborders:

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• Sauria, the lizards;
• Serpentes, the snakes;
• Amphisbaenia, the worm lizards.

Of these, the lizards form a paraphyletic group. In newer classifications the name Sauria is used for reptiles and birds in general, and the Squamata are divided differently:

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• Suborder Iguania
• Suborder Scleroglossa
• Infraorder Gekkota
• Infraorder Anguimorpha
• Infraorder Scincomorpha
• Infraorder Serpentes
• Infraorder Amphisbaenia

The exact relationships within these two suborders are not entirely certain yet.

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Squamata: External links ►



 

Lizard: :...

Scales: REDIRECTScale...

Quadrate: The quadrate is a jaw bone in all jawed vertebrates except mammals (in whom it has become a middle-ear bone, the incus). It connects to the quadratojugal and squamosal in the skull, and articulates with the lower jaw bone that is uncreatively called the articular....