 They are called "softshell" because their carapaces lack horny scutes (scales), though the spiny softshell, "Apalone spinifera", does have some scale-like projections, hence its name.The carapace is leathery and pliable, particularly at the sides.The central part of the carapace has a layer of solid bone beneath it, as in other turtles, but this is absent at the outer edges.