Shell Structure
An important part of protecting and identifying Arakan forest turtles (Heosemys depressa) is their unique and striking shell. The top shell, or carapace, and the lower shell, or plastron, are the two primary components of this turtle's shell; each have their own distinct structure and set of traits.
The characteristic feature and scientific term "depressa" are the comparatively low and depressed carapace of the Arakan forest turtle. As a result of its relatively flat shell, turtles are better able to move about in their native environment, even in the presence of thick underbrush and forest floor litter. Because of its dark brown to black carapace, this animal is able to blend in well with its woodland surroundings.
It is common for turtles to have a distinct pattern in the arrangement of their scutes, the bony plates that cover their carapace. As the turtle matures, it sheds and produces new scutes formed of keratin, the same protein that is responsible for human hair and nails. The sleek look of the shell is enhanced by the absence of noticeable keels or ridges on the scutes of the Arakan forest turtle.
The wide and flat plastron shields the underbelly of the Arakan woodland turtle. Typically, it has a paler hue, anywhere from pale brown to yellowish, compared to the carapace. A unique pattern of scutes on the plastron may be utilized to determine the species. The internal organs of a turtle are protected by a stiff structure called the plastron, which is attached to the carapace by bony bridges on both sides.
The shell of an Arakan forest turtle has a unique hinge mechanism that is easily noticeable. In order to seal their shell more firmly in the event of danger, some turtles possess a plastron that is hinged.
The plastron of an Arakan forest turtle may not be as hinged as those of other turtle species, but it nevertheless offers great protection from predators. Turtles can protect themselves from danger by drawing their sensitive parts—their head, limbs, and tail—inside their shell, thanks to its structure.
