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Rhynchocephalia

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Rhynchocephalia [‚riŋ·kō·sə′fāl·yə]
(vertebrate zoology)
An order of lepidosaurian reptiles represented by a single living species,Sphenodon punctatus,and characterized by a diapsid skull, teeth fused to the edges of the jaws, and an overhanging beak formed by the upper jaw.


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The reptile segment (59 pages) covers all four reptilian orders: Testudines (turtles and tortoises), Crocodilia, Rhynchocephalia (tuataras), and Squamata (amphisbaenians, lizards, snakes).
Its cousins in the reptilian order Rhynchocephalia all died out 139 million years ago.
 
 
 
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