GEOCHELONE DENTICULATA PDF

Taxonomy[ edit ] The yellow-footed tortoise is also called the yellow-foot or yellow-legged tortoise, the Brazilian giant tortoise, or South American forest tortoise, as well as local names such as morrocoy, woyamou or wayamo, or some variation of jabuta. Many of the local names are shared with the similar red-footed tortoise. Soon the term Testudo was only being used for tortoises as opposed to all chelonians, with tortoises defined by completely terrestrial behaviors, heavy shells, and elephant-like limbs with nails but no visible toes. The species got several other names, as well, for several reasons such as difficulty in distinguishing it from the red-footed, confusion over locations, researchers thinking they had discovered a new species in collections or in the field, etc. Leopold Fitzinger created the genus Geochelone , meaning "earth turtle" for medium-to-large tortoises that did not come from the Mediterranean area which remained Testudo , or have other special characteristics such as the hinged shells of the genus Kinixys.

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Taxonomy[ edit ] The yellow-footed tortoise is also called the yellow-foot or yellow-legged tortoise, the Brazilian giant tortoise, or South American forest tortoise, as well as local names such as morrocoy, woyamou or wayamo, or some variation of jabuta.

Many of the local names are shared with the similar red-footed tortoise. Soon the term Testudo was only being used for tortoises as opposed to all chelonians, with tortoises defined by completely terrestrial behaviors, heavy shells, and elephant-like limbs with nails but no visible toes. The species got several other names, as well, for several reasons such as difficulty in distinguishing it from the red-footed, confusion over locations, researchers thinking they had discovered a new species in collections or in the field, etc.

Leopold Fitzinger created the genus Geochelone , meaning "earth turtle" for medium-to-large tortoises that did not come from the Mediterranean area which remained Testudo , or have other special characteristics such as the hinged shells of the genus Kinixys. Fitzinger further used the term Chelonoidis as a subgenus to categorize Geochelone from South America. Neither term was widely used until they were resurrected by researchers such as Williams in They created or re-established several genera: Aldabrachelys , Astrochelys , Cylindraspis , Indotestudo , Manouria , and Chelonoidis.

The debate is on-going over the definitions and validity of some of these genera. Chelonoidis is primarily defined as being from South America, lacking a nuchal scute the marginal scute located over the neck and a large, undivided supracaudal the scute or scutes directly over the tail. The taxonomic and evolutionary relationship of these two groups is poorly understood.

The carapace shell top is a long oval with parallel sides and a high-domed back that is generally flat along the vertebrals scutes or shell scales along the top of the carapace with a slight peak near the hind end. There are five vertebral scutes, four pairs of costals, eleven pairs of marginals, no nuchal scute the marginal over the neck and a large, undivided supracaudal the marginals over the tail.

The front and rear marginals scutes along the edge of the carapace are slightly serrated in front and rear of young yellow-footed tortoises. The carapace is yellowish brown to dark brown or even black at the edges of the scutes. The areola in each scute are pale yellow, orange or light brown and blend into the darker carapace.

The plastron shell bottom is thick around the edges, and the gulars front pair of plastron scutes do not project past the carapace. The plastron is yellow-brown turning nearly black near the seams. The head is relatively small and longer than wide. The upper jaw has three tooth-like points. There are large black eyes with a tympanum behind each eye. The skin of the head and limbs is black with yellow to orange scales on top and around the eye and ear.

The forelimbs have five claws, are long and slightly flattened. They are covered with fine, dark scales and slightly overlapping larger scales on front in the same color as the head. The hind limbs are elephant-like with four claws, and are covered in small scales colored like the forelimbs.

The tail varies in length by gender and has a row of colored scales on the sides. Males develop a distinctive incurving of sides, giving them a well-defined "waist", and a deeply in-curved plastron.

The female has a short, conical tail, while the male has a longer, more muscular tail that is generally carried tucked along one side. The anal notch of the male is also larger, presumably to allow better tail mobility. Some feel they prefer grasslands and dry forest areas, and that rain-forest habitat is most likely marginal. Others suggest humid forest is the preferred habitat. Regardless, they are found in drier forest areas, grasslands, and the savanna, or rainforest belts adjoining more open habitats.

The red-footed tortoise shares some of its range with the yellow-footed tortoise. In ranges shared in Surinam, the red-footed tortoise has moved out of the forests into grasslands created a result of slash and burn agriculture , while the yellow-footed tortoise has remained in the forest. Behavior[ edit ] These tortoises make a sound like a baby cooing with a raspy voice. Tortoises also identify each other using body language. The male tortoise makes head movements toward other males, but the female does not make these head movements.

Male tortoises also swing their heads back and forth in a continuous rhythm as a mating ritual. Mating occurs all year round for the yellow-footed tortoise.

There is no parental care of the young and the baby tortoises will fend for themselves, starting by eating calcium -rich plant matter. They are too slow to capture any fast animals. In the wild, their diets consist of grasses , fallen fruit, carrion , plants, bones , mushrooms, excrement, and slow-moving invertebrates such as snails , worms, and others they are able to capture. In captivity, they are fed oranges, apples, melons, endive, collard greens , dandelions , plantain, ribwort, clover, shredded carrots, insects, worms, cuttlebone, tortoise vitamins, edible flowers, and alfalfa pellets.

Each yellow-footed tortoise in the wild reaches the age of maturity at about 8—10 years. The fecundity of a female generally depends on her size; the bigger they are, the more eggs they can produce. On average, a female will create about six to 16 eggs per year, although some female individuals may not reproduce each year. The egg size will increase with the body size of the tortoise.

The young are self-sufficient from birth. The yellow-footed tortoise can live around 50—60 years. Reproduction and growth[ edit ] Breeding is synchronized with the onset of the rainy season from July to September , where a general increase in activity is noted. Males identify each other by eliciting a characteristic head movement, a series of jerks away from and back to mid-position.

Another male will make the same head movements. No head movement in response is the first indication that the other tortoise is a female. Scientific experimentation and observation has also indicated head coloration has to be correct. He will then sniff the cloacal region of the other tortoise. Copulation usually follows, though sometimes there is a period of biting at the legs. During courtship and copulation, the male makes clucking sounds very much like those of a chicken, with a set pattern in pitches of the clucking sounds.

Rival males will battle, attempting to overturn each other, but neither the males nor females will defend a territory. They are considered nomadic in their movements.

In almost every tortoise species where male combat occurs, the males are always larger than the females. This is in comparison to aquatic species, where the males are usually smaller than the females and do not engage in male-to-male combat.

Species with male combat are thought to have evolved larger males because they have a better chance of winning a bout and mating with a female, thus passing on their larger size to their offspring. Species with smaller males evolved because smaller males are more mobile and can mate with a large number of females, thus passing on their genes. Chelonoidis denticulata is an endangered species. As with many species of turtles and tortoises, many yellow-footed tortoises end up as food items in local markets.

This species of tortoise is popular in the pet trade.

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Species was not fully specified, species name missing!

Yellow-foot tortoises are more subdued in their beauty as compared with a number of the tortoises of the genus Geochelone. Nevertheless they are a sought after addition in many collections the world over. This designation is somewhat misleading as there are some that never grow beyond 14 inches 34 cm as adults. Upon initial sighting, a Yellow-foot tortoise looks very similar to the closely related Red-foot tortoise, Geochelone carbonaria, with the primary distinction being the presence of yellow scales on the forelegs of G. However, of all of the differences for these two species, this is actually the most variable. While Red-foots may be more intensely colored, this is not a universal distinction; there are Yellow-foots that are very brightly patterned and comparatively drab Red-foots. While there are numerous morphometric differences between these two species, by far the easiest method of telling Red-foots and Yellow-foots apart is the differences in the scalation of their heads.

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In , Leopold Fitzinger used Geochelone to differentiate some non-Mediterranean tortoises, apparently based on size and lack of specific identifying characteristics such as the hinged shell in the African hingeback tortoises. He used the term Chelonoidis as a subgenus for the species from South America. Few people used these terms until they were resurrected by Hewitt in and Loveridge and Williams in In , Roger Bour and Charles Crumly each separated Geochelone into different genera based on anatomic differences, especially in the skulls. That resulted in the formation or restoration of several genera: Aldabrachelys , Astrochelys , Cylindraspis , Indotestudo , Manouria , and Chelonoidis. Chelonoidis was distinguished from other Geochelone by their South American location, as well as the absence of the nuchal scute the marginal centered over the neck and the presence of a large, undivided supracaudal the scute or scutes directly over the tail , as well as differences in the skull.

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