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The turtle shell is a shield for the ventral and dorsal parts of turtles (the order Testudines), completely enclosing all the vital organs of the turtle and in some cases even the head. [1] It is constructed of modified bony elements such as the ribs, parts of the pelvis and other bones found in most reptiles.
A distinguishing characteristic of the genus is the secondary division of the abdominal scutes (the middle pair of scutes in the plastron) due to the development of the plastral hinge as the turtle matures. It eventually leads to the formation of small triangular additional scutes between the abdominal and pectoral scutes. [17]
Geoemydidae are turtles of various sizes (from about 10 to 80 cm (4 to 30 in) in length) with often a high degree of sexual dimorphism. They usually have webbed toes, and their pelvic girdles articulate with their plastrons flexibly. Their necks are drawn back vertically. Their carapaces have 24 marginal scutes. The plastron is composed of 12 ...
A scute (/ s k j uː t / ⓘ) or scutum (Latin: scutum; plural: scuta "shield") is a bony external plate or scale overlaid with horn, as on the shell of a turtle, the skin of crocodilians, and the feet of birds.
Side-necked turtles additionally have "intergular" scutes between the gulars. [16] [21] Turtle scutes are usually structured like mosaic tiles, but some species, like the hawksbill sea turtle, have overlapping scutes on the carapace. [16] The shapes of turtle shells vary with the adaptations of the individual species, and sometimes with sex ...
Trionyx is a genus of softshell turtles belonging to the family Trionychidae. In the past many species in the family were classified in this genus, but today T. triunguis, the African or Nile softshell turtle, is the only extant softshell still classified as Trionyx. The other species still assigned to this genus are only known from fossils.
Trionychidae is a family of turtles, commonly known as softshell turtles or simply softshells.The family was described by Leopold Fitzinger in 1826. Softshells include some of the world's largest freshwater turtles, though many can adapt to living in highly brackish waters.
Eastern box turtles have a high, domelike carapace and a hinged plastron that allows total shell closure. Their shell has a middorsal keel that smooths out with age. [5] The carapace can be of variable coloration but is normally brownish or black and accompanied by a yellowish or orangish radiating pattern of lines, spots, or blotches.
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