determination of turpin's sex?

http://www.chelonia.org/sexdetermination.htm

http://exoticpets.about.com/od/aquaticturtles/f/se...

read the above links.

The only feasible way to determine the sex of any species of turtle is to look at the position of the vent, under the tail. If, with the tail held straight back, the vent is well beyond the upper shell, you have a mature male. Otherwise, you have either a female or an immature. In some species, the males grow front claws that are much longer than their rear ones.