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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. This is not the case in Cryptodires which have a floating pelvis.
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.
A further difference between the suborders is the attachment of the pelvis. In Cryptodira, the pelvis is free, linked to the shell only by ligaments. In Pleurodira, the pelvis is sutured , joined with bony connections, to the carapace and to the plastron, creating a pair of large columns of bone at the back end of the turtle, linking the two ...
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 ...
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 carapace is flatter than it is broad and possesses lateral margins." "The sternites are fused into a wide sternal plastron which possesses a distinct emargination on its posterior margin." "The pleon is flattened and strongly bent, in dorsal view completely hiding the tergites of the fourth pleonal segment, and partially or completely ...
The borders of the carapace are made up of peripheral and marginal scales. [4] The pygal bone sits at the posterior end of the shell, and the suprapygal sits right above it. [4] Basilemys' plastron is octagonal and elongated. [4] Like the carapace, the plastron is made up of many bony elements, and the plastron can be divided into five distinct ...
It has a black or brown carapace. The top of the tail and feet are a grayish brown, while the underside (plastron) is yellowish. The male turtle is distinguished by its long, thick tail. A female tends to have a shorter tail and a broader carapace. A hatchling has a shell size of about 3 cm (1.2 in) in length, and is olive to black in color.