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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.
A turtle’s shell is a very effective form of protection from predators, as they can pull their head, legs, and tail inside the shell, which makes it very difficult for the predator to attack ...
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 ]
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 ...
Discarded exoskeleton of dragonfly nymph Exoskeleton of cicada attached to a Tridax procumbens (colloquially known as the tridax daisy)An exoskeleton (from Greek έξω éxō "outer" [1] and σκελετός skeletós "skeleton" [2] [3]) is a skeleton that is on the exterior of an animal in the form of hardened integument, which both supports the body's shape and protects the internal organs ...
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 ...
This could find support in turtle remains discovered on New Zealand, which have been interpreted by Worthy and colleagues to represent a potential meiolaniid. Little is known about this form, but it is argued that the presence of a large terrestrial tortoise dispels the hypothesis that New Zealand was entirely flooded in this time period. [27]
The largest living species of turtle (and fourth-largest reptile) is the leatherback turtle, which can reach over 2.7 m (8 ft 10 in) in length and weigh over 500 kg (1,100 lb). [9] The largest known turtle was Archelon ischyros , a Late Cretaceous sea turtle up to 4.5 m (15 ft) long, 5.25 m (17 ft) wide between the tips of the front flippers ...
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