Knowra Turtle Turtle A reptile whose body is enclosed by a bony shell formed from expanded ribs, vertebrae, and other skeletal elements. Turtles include sea turtles, freshwater turtles, and tortoises.
Turtle shell : A turtle’s bony carapace and plastron, joined by bridges and covered by skin or keratinous scutes. Its integration with the skeleton, rather than a removable outer casing, defines turtle anatomy.
Evolution of the turtle shell : The evolutionary transformation of ribs, vertebrae, and other bones into the turtle’s protective shell. It explains how a distinctive body plan arose without the shell being an external addition.
Sea turtle : A turtle adapted to marine life, with flipper-like limbs and a body suited to swimming. Sea turtles show how the turtle body plan can be adapted to open water.
Turtle migration : Regular long-distance movement by turtles between feeding, breeding, or nesting areas. Migratory routes make marine turtles vulnerable to threats across national boundaries.
Carapace : The upper portion of a turtle’s shell, formed from fused skeletal elements and often covered by scutes. It is the shell’s dorsal structure and incorporates expanded ribs and vertebrae.
Turtle respiration : The process by which turtles ventilate their lungs using muscles and body movements. A rigid shell prevents the rib-based breathing movements used by most other vertebrates.
Tortoise : A primarily terrestrial turtle, often with sturdy limbs and a domed shell. Tortoises illustrate a land-adapted form within the broader turtle group.
Sea turtle conservation : Efforts to protect sea turtles, their nesting beaches, and marine habitats. Slow reproduction and human-caused mortality make conservation central to many turtle populations.
Plastron : The ventral portion of a turtle’s shell, usually composed of bony plates. It protects the underside and complements the carapace.
Turtle locomotion : The ways turtles move on land and through water using limbs adapted to different habitats. Shell shape and limb structure constrain and shape how turtles travel.
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