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Odontochelys semitestacea (meaning "toothed turtle with a half-shell") is a Late Triassic relative of turtles [1].Before Pappochelys was discovered and Eunotosaurus was redescribed, [2] Odontochelys was considered the oldest undisputed member of Pantestudines (i.e. a stem-turtle).
Gamera's shell is presented as being incredibly resilient and strong (only ever being damaged by Guiron, Legion , Iris, and Zedus), and can deflect missiles and other projectiles. His plastron (lower shell) is more vulnerable than his carapace (upper shell), however, and he has been wounded in his plastron to the point of bleeding.
Proganochelys is a genus of extinct, primitive stem-turtle.Proganochelys was named by Georg Baur in 1887 as the oldest turtle in existence at the time. The name Proganochelys comes from the Greek word ganos meaning 'brightness', combined with prefix pro, 'before', and Greek base chelys meaning 'turtle'.
It has been shown that C. testudinaria can relocate on the turtle's shell, [5] usually towards the optimal position with maximum water flow and thus the greatest filter feeding opportunities. The movement is around 1.4 mm (0.06 in) or less per day and is probably achieved by advancing the shell forward with each increment of growth.
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.
The shells of cyamodontoids differ from those of turtles in several ways. Turtle shells are fused to their skeletons in several regions, including the vertebrae, ribs, gastralia (belly ribs), and pectoral girdles, but cyamodontoid shells overlie skeletal bones without any fusion. Turtle shells are also composed of two layers of osteoderms ...
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.
The oldest version of the Aspidochelone legend is found in the Physiologus (2nd century AD) : [1]. There is a monster in the sea which in Greek is called aspidochelone, in Latin "asp-turtle"; it is a great whale, that has what appear to be beaches on its hide, like those from the sea-shore.