What tortoise do I have?

by C.J. Lockwood
(Arizona)

Sorry i dont have a picture but..Ive had a tortoise for about 6-8 years and I still dont know what kind it is! I was hoping you could help

The tortoises shell is in diffrent shapes around its blackish and inside of the square its somewhat brown,yellow, and orange. The bottom of the shell is a dark/ faded yellow. It has 5 claws on all four legs (Not sure if it matters) It has a small tail too. For being about 7 years old it isnt really big at the time its in a 55Gal tank filled with sand. It gets light every day, and it seems all it eats is lettuce.

I hope you could tell me what kind it is :]

P.s. I dont know what gender it is/ how can you tell?