Cryptodira


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Cryptodira

[‚krip·tə′dī·rə]
(vertebrate zoology)
A suborder of the reptilian order Chelonia including all turtles in which the cervical spines are uniformly reduced and the head folds directly back into the shell.

Cryptodira

 

an order of turtles of the subclass Testudinata. The carapace consists of bony plates covered with horny scales. The neck and head can be withdrawn into the carapace by a vertical flexure of the neck.

There are 140 species, making up 30 genera from six families. The turtles represent about two-thirds of all living turtle species. The six families are Emydidae (common freshwater turtles), Kinosternidae (mud turtles and musk turtles), Chelydridae (snapping turtles), Dermatemydidae (with a single species, the Central American river turtle), Platysternidae (with a single species, the big-headed turtle), and Testudinidae (land tortoises). The USSR has two species of common freshwater turtles and two species of land tortoises.

Some zoologists consider the Cryptodira a suborder.

References in periodicals archive ?
Reptilia Testudines Cryptodira Testudinidae Testudo sp.
The suborder Pleurodira (Cope 1864) is distinguished by the following combination of characters (after Legler and Georges 1993): the neck flexes laterally to either side and tucks under the anterior edge of the carapace; a trochlear pulley system of the adductor muscles of the jaw utilizes the lateral process of the pterygoid bone to enhance muscular efficiency as opposed to the situation in the Cryptodira where the antero-dorsal edge of the otic capsule is used; and the pelvis is always fused to the plastron.
A pesar de su naturaleza fragmentaria, el material aqui mencionado es referible al suborden Cryptodira sobre la base de ausencia de cicatrices para la articulacion entre la cadera y el plastron (LAPPARENT DE BROIN & DE LA FUENTE, 2001).
Palabras clave: Testudines, Cryptodira, Trionyx triunguis (Forskal, 1775), Glarichelys knorri (Gray, 1837), Allopleuron lipsiensis n.
Key words: Testudines, Cryptodira, Trionyx triunguis (Forskal, 1775), Glarichelys knorri (Gray, 1837), Allopleuron lipsiensis n.