turtleskin

Turtleskin refers to the outer protective layer of a turtle, commonly known as its shell. This intricate structure is composed of bone and keratin, fused to the turtle's ribs and vertebral column. The shell is divided into two main parts: the carapace, which covers the back, and the plastron, which covers the underside. These bony plates are then covered by scutes, which are made of keratin, the same material found in human fingernails and hair. The pattern and color of these scutes can vary greatly among different turtle species, often serving as camouflage or for species recognition.

The shell is a vital part of a turtle's anatomy, offering defense against predators and providing structural support. Unlike in some fictional portrayals, a turtle cannot shed its shell. The shell grows with the turtle, and the scutes are added over time. While the scutes can wear down or get damaged, they are not shed and replaced in distinct layers. The underlying bone of the shell is living tissue and can heal if injured. The texture and thickness of the turtleskin, or shell, are adapted to the turtle's environment and lifestyle, with aquatic species often having smoother, more streamlined shells, while terrestrial species may have domed, heavier shells.