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The turtle shell is a shield for the ventral and dorsal parts of turtles (the order Testudines), completely enclosing all the vital organs of the turtle and in some cases even the head. [1] It is constructed of modified bony elements such as the ribs, parts of the pelvis and other bones found in most reptiles.
The lifespan of a turtle is largely dependent on the species. As a general rule, tortoises live the longest, but turtles are also fairly long-lived compared to most domestic pets, assuming all ...
The diapsids are extremely diverse, and include birds and all modern reptile groups, including turtles, which were historically thought to lie outside the group. [2] All modern reptiles and birds are placed within the neodiapsid subclade Sauria .
Skeleton of an alligator snapping turtle (Macrochelys temminckii) on display at the Museum of OsteologyTraditionally, only a single extant species (M. temminckii) was recognized, but following reviews, two species are now recognized: [4] [5] Anatomical differences between the two species of Macrochelys include the shape of the caudal notch at the rear of the carapace and the angle of the ...
However, weights based on volumetric displacement of the skeleton suggest a mass of around 1,000 kg (2,200 lb). [4] M. atlas is thus the largest known tortoise. [2] Some island species were considerably smaller, with the Philippine species Megalochelys sondaari only having a carapace length of 70–90 cm (2 ft 4 in – 2 ft 11 in). [1]
Skull of a cryptodiran turtle from the family Emydidae Dorsal view of skull and cervical vertebrae of a cryptodiran turtle from the family Emydidae. Not all cervical vertebrae are featured due to the dissection cut. The Cryptodira (Greek: hidden neck) are a suborder of Testudines that includes most living tortoises and turtles. Cryptodira is ...
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 ...
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