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Sea turtles (superfamily Chelonioidea), sometimes called marine turtles, [3] are reptiles of the order Testudines and of the suborder Cryptodira. The seven existing species of sea turtles are the flatback , green , hawksbill , leatherback , loggerhead , Kemp's ridley , and olive ridley .
The Carettochelyidae, Cheloniidae, Chelydridae, Dermatemydidae, Dermochelyidae, Emydidae, Kinosternidae, Testudinidae and Trionychidae are all cryptodires, although the ability to retract the head has been lost in the sea turtles (Cheloniidae and Dermochelyidae). A third order, the Paracryptodirans, are extinct.
Sea turtles, and several extinct forms, have evolved a bony secondary palate which completely separates the oral and nasal cavities. [30] The necks of turtles are highly flexible, possibly to compensate for their rigid shells. Some species, like sea turtles, have short necks while others, such as snake-necked turtles, have long ones.
Hawksbill sea turtle (Eretmochelys imbricata) Sea turtles: there are seven extant species of sea turtles, which live mostly along the tropical and subtropical coastlines, though some do migrate long distances and have been known to travel as far north as Scandinavia. Sea turtles are largely solitary animals, though some do form large, though ...
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In contrast to their earth-bound relatives, tortoises, sea turtles do not have the ability to retract their heads into their shells. Their plastron, which is the bony plate making up the underside of a turtle or tortoise's shell, is comparably more reduced from other turtle species and is connected to the top part of the shell by ligaments without a hinge separating the pectoral and abdominal ...
This category contains articles about the family in the order Testudines - the turtles. For individual species, see the appropriate subcategories. For individual species, see the appropriate subcategories.
Cheloniinae is a subfamily of the sea turtle family Cheloniidae. Its parent superfamily is Chelonioidea . The members of the subfamily, and genera that make it up, are: