Here are some care sheets:

A Turtle can be easily identified by its shell. The shell plays a vital part in protection.
Not much has changed in over 200 million years of evolution. Turtle shell form and function is still the same.
Shell is divided in two parts.
Upper part is called the carapace and the bottom plastron.
On the turtle’s side plastron and carapace are joined together with bony structures called bridges.
The inner layer of the shell is made out of bones. Including the backbone and the ribs. That basically means that the turtle can’t leave the shell. Turtle shell is covered with bony scales (also called scutes). Scutes are made of keratin.
Substance found in hair and nails of other animals. Melanin in scutes is the reason for various pigmentation and different designs.