Cryptodera Lichtenstein, 1856 Cryptodira Cope, 1868 Cryptodiramorpha Lee, 1995 Pancryptodira Joyce, Parham, and Gauthier, 2004 | synonyms_ref = }} Cryptodira is the taxonomic suborder of Testudines that includes most living tortoises and turtles. Cryptodira differ from Pleurodira (side-neck turtles) in that they lower their necks and pull the head...
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http://en.wikipedia.org/wiki/Cryptodira
(from the article `turtle`) ...necks, have eight cervical vertebrae, but those that fold their neck vertically can withdraw the head into the shell. These are the so-called ...
Found on
http://www.britannica.com/eb/a-z/c/165
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