Turtle sex red eared slider

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Skip to search form Skip to main content. Estrogen and sex reversal in turtles: a dose-dependent phenomenon. Even at dosages resulting in mixtures of males and females, nearly all hatchlings had normal-appearing ovaries or testes.

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Identifying the gender of a turtle is not a simple task to do. Unlike other mammals, turtles do not have any distinct sign that declares its gender such as external genitalia. It makes identifying the sex of a turtle much more challenging, but not impossible.

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If you keep pet turtles, it's nice to know if you've got boys or girls. However, unlike many mammals, turtles have no external genitalia. This makes determining their sex much more difficult, but it's not impossible.

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Red-eared sliders Trachemys scripta elegans are some of the most frequently spotted turtles around, in their natural sluggish-water environments as well as in captive habitats. If you come across one of these family Emydidae creatures in the wild, you might be able to confound your pals by specifying the sex. Boy and girl red-eared sliders have some sexual dimorphism and therefore look somewhat different -- though both sexes have the signature red markings close to their eyes. Size difference is a convenient means of telling boy and girl red-eared sliders apart.

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Description: Red-eared Sliders are brightly marked, and look similar to the painted turtle. The carapace top shell of the Red-eared Slider is higher domed than that of the Western Painted Turtle and is weakly keeled. Characteristics that most obviously distinguish the Slider include yellow marginal scutes, a yellow plastron covered in dark, blotchy markings, and a red ear mark located just behind the eye although this ear mark is not always visible in older specimens.

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The phenomenon was first discovered in reptiles more than 50 years ago, but until now the molecular details were a mystery. For a common pond and pet turtle called the red-eared slider, for example, eggs incubated at 32 degrees Celsius nearly 88 Fahrenheit produce all female hatchlings, while those kept at 26 degrees Celsius 79 Fahrenheit hatch as males. They found several genes that were turned up or down at one temperature but not the other.

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Many egg-laying reptiles lack sex chromosomes, depending instead upon the incubation temperature of the egg to determine the sex of their offspring, a process known as temperature-dependent sex determination TSD. How temperature both stimulates and inhibits genetic cascades to determine the type of gonad and direct sexual differentiation is the focus of this application. This investigator and his colleagues have developed the red-eared slider turtle Trachemys scripta elegans as an animal model system to study TSD.

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In the Aug. Toastier nest temperatures, rather than sex chromosomes, turn baby turtles female. When researchers dialed down that gene early in development, turtle embryos incubating at the cooler climes that would normally yield males turned out female instead, researchers report in the May 11 Science.

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Imagine a child inside a womb with a sex yet to be decided not by the pair of sex chromosomes but by the ambient temperature — well, that is how the sex of red-eared slider turtle Trachemys scripta elegans and other reptile species is determined. Whether the baby red-eared slider turtle develops into a male or female will depend on the ambient temperature of the nest. The eggs hatching from a cooler nest will be males whereas those in a warmer nest will be females.

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