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The ventral surface is called the plastron. [2] [3] These are joined by an area called the bridge. The actual suture between the bridge and the plastron is called the anterior bridge strut. [4] In Pleurodires the posterior pelvis is also part of the carapace, fully fused with it.
Diagram of a prawn, with the carapace highlighted in red. A carapace is a dorsal (upper) section of the exoskeleton or shell in a number of animal groups, including arthropods, such as crustaceans and arachnids, as well as vertebrates, such as turtles and tortoises. In turtles and tortoises, the underside is called the plastron.
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. Some species also have dermal bones in the plastron, but these are not attached to the bones of the shell. The light and flexible shell of these ...
Like other amniotes (reptiles, birds, and mammals) they breathe air and do not lay eggs underwater, although many species live in or around water. Turtle shells are made mostly of bone; the upper part is the domed carapace, while the underside is the flatter plastron or belly-plate.
The carapace has a hydrodynamic appearance and is broad with a moderately low keel. The rear of the carapace is flared and the rear marginals form serrations. The plastron is yellowish and is marked by a central dark blotch (plastral figure) that follows the sutures of the plastral scutes and fades with age so that many adults lack a pattern ...
The generic name Sternotherus is Greek meaning hinged breast or chest, referring to the hinged plastron. [3] The trivial names, or specific epithets include: carinatus – Latin for keeled in reference to the shape of the carapace; [4] depressus – Latin for pressed down or low also referring to the shape of the carapace; [5] intermedius – Latin for intermediate, historically believed to be ...
The carapace is brown, sometimes yellow or orange bordered, with a red to orange medial stripe. The plastron is long and narrow; the forelobe is much shorter than the broad bridge, and the hindlobe is slightly shorter than the bridge and contains a posterior anal notch. The humero-pectoral seam joins the plastral seam at an obtuse angle.
The carapace of T. s. troostii is olive brown with yellow markings. It has two rounded projections on the posterior edge of the shell, and is slightly keeled. The adult carapace is wrinkled and oval shaped. The plastron is hingeless and slightly smaller than the carapace. Each of the bottom sides of the marginals has a spot.