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The shell of a bivalve is composed of calcium carbonate, and consists of two, usually similar, parts called valves.These are joined together along one edge (the hinge line) by a flexible ligament that, usually in conjunction with interlocking "teeth" on each of the valves, forms the hinge.Drawing of freshwater pearl mussel (Margaritifera margaritifera) anatomy: 1: posterior adductor, 2: anterior adductor, 3: outer left gill demibranch, 4: inner left gill demibranch, 5: excurrent siphon, 6: incurrent siphon, 7: foot, 8: teeth, 9: hinge, 10: mantle, 11: umbo Bivalves vary greatly in overall shape.Some, such as the cockles, have shells that are nearly globular; cockles can jump by bending and straightening their foot. The debate and question that's being asked is it BIBLICAL?A hermaphrodite is a person with both female and male genital characteristics and can also be called intersex.
In all molluscs, the mantle forms a thin membrane that covers the animal's body and extends out from it in flaps or lobes.
Others, such as the razor clams, are burrowing specialists with elongated shells and a powerful foot adapted for rapid digging.
The shipworms, in the family Teredinidae have greatly elongated bodies, but their shell valves are much reduced and restricted to the anterior end of the body, where they function as scraping organs that permit the animal to dig tunnels through wood.
Bivalves as a group have no head and they lack some usual molluscan organs like the radula and the odontophore.
They include the clams, oysters, cockles, mussels, scallops, and numerous other families that live in saltwater, as well as a number of families that live in freshwater. The gills have evolved into ctenidia, specialised organs for feeding and breathing.Near the hinge of the shell is the umbo, often a rounded, knob-like protuberance usually surrounding the beak.