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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.
E. vaningeni and E. cicerops were ultimately placed in their own genus, Rhinocarcinosoma, by Nestor Ivanovich Novozhilov in 1962, based on the placement of the eyes, the shape of the carapace and the protrusion at the front of the carapace. [4] The genus name derives from the related genus Carcinosoma and the Greek ῥινός (rhinós, "nose ...
Carapace: A hardened plate (sclerite) covering the upper (dorsal) portion of the cephalothorax; [3] see also Carapace; Carpoblem: The principal tibial apophysis on the male pedipalp; also just called the tibial apophysis; Cephalic region or caput: The front part of the cephalothorax, separated from the thoracic region by the cervical groove [4]
The first fragmentary carapace only preserved the lower part of the head, ending in two pointed and concave arches. The eyes of this carapace were close together, in the middle of the carapace, and on a triangularly shaped elevated portion similar to some specimens of the related Hibbertopterus scouleri. In the second carapace specimen, the ...
Typically, a turtle has 38 scutes on the carapace and 16 on the plastron, giving them 54 in total. Carapace scutes are divided into "marginals" around the margin and "vertebrals" over the vertebral column, though the scute that overlays the neck is called the "cervical". "Pleurals" are present between the marginals and vertebrals. [20]
In an international study, the layer can be as thick as two to four cells. Even with such a small thickness, the epidermis allows the deformation the shell can experience and provides the shell more support. [5] The epidermis layer is apparent in both sections of the shell, carapace, and plastron, and is thicker in critical areas.
It is the largest freshwater turtle known to have existed, with a carapace over 2 meters long. Its fossils have been found in northern South America, in rocks dating from the Middle Miocene to the very start of the Pliocene, about 13 to 5 million years ago. Male specimens are known to have possessed bony horns growing from the front edges of ...
Eocarcinosoma was a small carcinosomatid eurypterid. [1] Although size estimates of E. batrachophthalmus being as small as 3 centimetres (1.2 in) in length have been published, [2] these are impossible given that the carapace (head plate) of the type specimen measures 2.05 centimetres (0.8 in) in length and is 2.42 centimetres (0.95 in) wide at its widest point.