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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.
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 ...
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 ...
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 ...
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]
The combination of endoskeleton (which allows much larger body sizes for the same skeletal mass) and a more robust and efficient nervous system (which enables more acute perception and more sophisticated motor control) gives vertebrates much quicker body reactivity and behavioral adaptability, which have led to marine vertebrates dominating ...
The northern river terrapin (Batagur baska) is a species of riverine turtle native to Southeast Asia. It has been classified as Critically Endangered on the IUCN Red List and considered extinct in much of its former range; as of 2018, the population in the wild was estimated at 100 mature individuals.
The spiny softshell turtle (Apalone spinifera) is a species of softshell turtle, one of the largest freshwater turtle species in North America. Both the common name, spiny softshell, and the specific name , spinifera (spine-bearing), refer to the spiny, cone-like projections on the leading edge of the carapace , which are not scutes (scales).
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