plastron

Hello, I have 4 turtles and have not seen this before so hopefully someone can help me.. I took my ouachita map out today to check it over and noticed that its plastron seems to be sort of falling inwards in a kind of grid shape. Here's a photo, hopefully you can see what I mean. I hope...

Hi Guys Just wondering what sex my tort is? The plastron looks quite flat which would suggest it is a female but it has a little bit on the end of its tail and all my males have that so i really don't know so can somebody help me out! lol Marc