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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.
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Fish are fascinated with floating objects, which they use to mark locations for mating activities. They aggregate around objects such as drifting flotsam, rafts, jellyfish and floating seaweed. The objects appear to provide a "visual stimulus in an optical void", [ 2 ] and offer refuge for juvenile fish from predators. [ 3 ]
P. deltoides is an edible bivalve mollusc primarily found from the Eyre Peninsula to Kingston SE in South Australia and from Tasmania to Fraser Island in Queensland, with Younghusband Peninsula (Coorong Beach) in South Australia the site of the largest stock abundance in Australia, where they make up 85% of the total biomass.
Box turtles require an enclosed outdoor location, consistent sun exposure and a varied diet. Without this, a turtle's growth can be stunted and its immune system weakened. Finding box turtles in the wild and taking them as pets, even for a short period, can have detrimental effects. Box turtles want to stay within the area where they were hatched.
Freshwater bivalves, as their name implies, have a protective exoskeleton composed of two half-shells or "valves", connected via a soft ligament along a hinge. [4] These two valves are non-living, composed of both organic and inorganic substances that make up three major valve layers. [4]
Chelodina (Chelydera) expansa, commonly known as the broad-shelled river turtle, broad-shelled snake-necked turtle, [2] or giant snake-necked turtle, [3] is a pleurodiran freshwater turtle and is the largest of the long-necked turtles. [4] It is widely sympatric with the Murray River turtle and eastern snake-necked turtle. [5]
A. mutica is native to the United States, where it is distributed throughout the central and south-central states. Its natural geographic range extends from western Pennsylvania in the east to New Mexico in the west, as far north as the Dakotas, and south to the westernmost Florida Panhandle, where it is eventually replaced by the Florida softshell turtle (Apalone ferox).