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Cryptodira is commonly called the "Hidden-Neck Turtles" or the "Inside-Neck Turtles". Cryptodira differ from Pleurodira (side-necked turtles) in that they lower their necks and pull the heads straight back into the shells, instead of folding their necks sideways along the body under the shells' marginals.
The tortoise population is estimated to comprise some 6,300 individuals, a decline of 84% since 1840, and the subspecies is considered to be Vulnerable. The tortoise population formerly suffered through predation and trampling of eggs and hatchlings, as well as habitat degradation, by introduced animals including pigs, donkeys and goats.
The tortoise's range is limited to an area of about 800 km 2 on the slopes of the Sierra Negra volcano, from near sea-level to an altitude of around 1,000 m, at the southern end of Isabela Island. There it inhabits deciduous and evergreen forests, dry grassland, introduced vegetation and agricultural land. The population is estimated to ...
In prehistoric times, a large insular radiation of giant Chelonoidis existed on many West Indian islands, including the Bahamas, Greater Antilles and Lesser Antilles. While some species such as those on Curaçao, Anguilla, and Barbados are thought to have gone extinct during the Late Pleistocene, other species such as those on the Greater Antilles and the Bahamas are thought to have been ...
The marginated tortoise lives in more mountainous regions than Hermann's tortoise. It can be found in elevations as high as 1,600 m (5,200 ft). The black color of the carapace is helpful for survival in this environment, as it allows the tortoise to absorb a great deal of heat in a short time, helping it maintain its body temperature. Early in ...
Sea turtle shells are an ideal habitat for adult barnacles for three reasons. Sea turtles tend to live long lives, greater than 70 years, so barnacles do not have to worry about host death. However, mortality in sea turtle barnacles is often driven by their host shedding the scutes on which the barnacle is attached, rather than the death of the ...
ERNST CH (1988). "Cuora mccordi, a new Chinese box turtle from Guangxi Province".Proceedings of the Biological Society of Washington 101: 466-470.; FRITZ U, HAVAŠ P (2007
Chelonoidis niger chathamensis, commonly known as the Chatham Island giant tortoise or the San Cristóbal giant tortoise, is a subspecies of Galápagos tortoise endemic to San Cristóbal Island in the Galápagos.