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  • Turtle | Species, Classification, Facts | Britannica
    A turtle is any reptile with a body encased in a bony shell, including tortoises The turtle shell has a top (carapace) and a bottom (plastron) The carapace and plastron are bony structures that usually join one another along each side of the body, creating a rigid skeletal box Turtles are members of the order Testudines
  • Reptile | Definition, Characteristics, Examples, Facts | Britannica
    A reptile is any member of the class Reptilia, the group of air-breathing vertebrates that have internal fertilization, amniotic development, and epidermal scales covering part or all of their body The major groups of living reptiles are turtles, tuatara, lizards, snakes, and crocodiles
  • What’s the Difference Between a Turtle and a Tortoise?
    Well, actually, there’s a meaningful difference between tortoises and other turtles All tortoises are in fact turtles—that is, they belong to the order Testudines or Chelonia, reptiles having bodies encased in a bony shell—but not all turtles are tortoises If tortoises are turtles, why not just call all turtlelike creatures “turtle”?
  • reptiles - Students | Britannica Kids | Homework Help
    Reptiles produce amniotic eggs, which differ from those of amphibians by having special membranes and a shell that help prevent the embryo from drying up in a terrestrial environment where moisture levels may be low It was owing largely to their amniotic eggs that reptiles became the first vertebrates to adapt completely to life on land
  • Turtle - Reptile, Classification, Adaptations | Britannica
    Turtle - Reptile, Classification, Adaptations: The title of the turtle order was formerly Testudinata, although the term Chelonia was also regularly used Order Testudines comprises two suborders, Cryptodira with 263 species in 11 families and Pleurodira with 93 species in 3 families
  • Reptile - Evolution, Adaptation, Physiology | Britannica
    Reptile - Evolution, Adaptation, Physiology: Because of their long history and great diversity, the Reptilia, or reptiles in the broad phylogenetic sense, are especially difficult to classify in an orderly and consistent manner Reptiles derive from an anthracosaurian stock that shares a common tetrapod ancestor with amphibians
  • reptiles - Students | Britannica Kids | Homework Help
    common iguana 2:03 reptiles living reptiles alligator dinosaurs in scale leatherback turtle
  • Turtle - Evolution, Adaptation, Conservation | Britannica
    Turtle - Evolution, Adaptation, Conservation: The earliest turtles known date to the Late Permian Epoch Many of the oldest and most primitive forms lacked a shell, plastron, and a carapace The oldest sea turtle is known from the mid-Cretaceous Although Odontochelys, Proganochelys, and Eunotosaurus offer insight into early anatomy, the origin of turtles remains highly debated
  • Reptile - Adaptation, Diversity, Conservation | Britannica
    Reptile - Adaptation, Diversity, Conservation: Reptiles have a significant economic value for food and ecological services Reptiles like lizards control pests in homes and gardens; snakes prey on rodents Turtles, crocodiles, snakes, and lizards are regularly harvested in many tropical areas Reptiles have contributed significantly to various biomedical and basic biological research programs
  • Tortoise | Reptile, Habitat, Diet, Lifespan | Britannica
    A tortoise is any member of the turtle family Testudinidae that is easily recognized by its unique hind-limb anatomy made up of elephantine (or cylindrical) hind limbs and hind feet, and high-domed shell





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