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Freshwater turtle

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Possible Answers:

TERRAPIN.

Last seen on: Daily Boston Globe Crossword Sunday, 3 September 2023

Random information on the term “Freshwater turtle”:

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Cryptoderes Duméril and Bibron, 1834Cryptodera Lichtenstein, 1856Cryptodira Cope, 1868Cryptodiramorpha Lee, 1995Pancryptodira Joyce, Parham, and Gauthier, 2004

The Cryptodira (Greek: hidden neck) are a suborder of Testudines that includes most living tortoises and turtles. Cryptodira differ from Pleurodira (side-necked turtles) in that they lower their necks and pull the heads straight back into the shells, instead of folding their necks sideways along the body under the shells’ marginals. They include among their species freshwater turtles, snapping turtles, tortoises, softshell turtles, and sea turtles.

The Cryptodira are characterized by retraction of the head in the vertical plane, which permits for primarily vertical movements and restricted lateral movements outside of the shell. These motions are largely due to the morphology and arrangement of cervical vertebrae. In all recent turtles, the cervical column consists of nine joints and eight vertebrae. Compared to the narrow vertebrae and the closely positioned zygapophyses of the pleurodires, the cryptodires’ vertebrae take on the opposite shape. Their cervical vertebrae are more distended, and their zygapophyses (processes that interlock adjacent vertebrae) are much more widely spaced—features allowing for a condition called ginglymoidy, and ultimately, their “hidden” neck retraction. Ginglymoidy refers to the double articulation where articulation between the sixth and seventh vertebrae and the seventh and eighth vertebrae allows for bending of the neck into an S shape. Formation of this S shape occurs in one plane that enables retraction into the shell.

Freshwater turtle on Wikipedia

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