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14. The mantle, a thin membrane surrounding the body of the clam, secretes the shell. The gills also pick up oxygen from the surrounding water that it pushes through it's body, and uses this to oxygenate the body of the clam. 15. In some mollusks with shells, you can see the mantle extending from under the shell. Note the hatchet shape of the foot used to burrow into mud or sand. In female bivalves, the incurrent siphon receives sperm released by males upstream. Mollusk Structure and Function Most mollusks have a scraping feeding appendage known as a radula and an organ at the top of their bodies called a mantle. Read More; function in bivalve nourishment. Locate the palps, flaplike structures that surround & guide food into the clam's mouth. Locate the palps, (mouth flaps) structures that surround & guide food into the clam's mouth. Fertilization occurs inside the female, and the larvae develop in the gills before being discharged into the water through the excurrent siphon. Identify the foot, visceral mass, gills, and labial palps. Clam is a common name for several kinds of bivalve molluscs.The word is often applied only to those that are edible and live as infauna, spending most of their lives halfway buried in the sand of the seafloor or riverbeds.Clams have two shells of equal size connected by two adductor muscles and have a powerful burrowing foot. Observe the muscular foot of the clam, which is ventral to the gills. Observe the muscular foot of the clam ventral to the gills. Progress Note the hatchet shape of the foot used to burrow into mud or sand. It is attached to the soft visceral mass, which contains the other organs. Carnivorous species often have a proboscis capable of great extension, either invaginable or contractile. 12. Beneath the palps, find the mouth. Find the mantle and if necessary, remove it to expose the internal structures of the clam. Internal Clam Siphons Anatomy Incurrent- incoming water contains oxygen and tinyyf food organisms Excurrent- metabolic wastes are expelled Gills 2 pairs on each side Fil fdlter out food particles and provide for gas exchange Labial palps (2) At ends of gills provide for food sorting prior to entering mouth The mouth itself frequently is prolonged into a proboscis that extends well in front of the tentacles. 13. The material that the clam produces to catch food is a thick mucus, that has the texture of glue. The gills also draw oxygen from the water flow. A pair of labial palps are located at the anterior end of each set of gills. Other than that, most other, more highly developed, bivalves feed by filtering their respiration water. In mollusks that lack shells, such as the slug, the mantle is completely visible. Food is trapped by mucus on the gills and moved by cilia to the mouth. …the mouth form lobes called labial palps, which help to locate prey. Where are the palps found and what is their function? From there, the food-mucus mixture is transported along a groove to the palps (mouth flaps) which push it into the clam's mouth. Describe the movement of food from the current siphon through the digestive system of the clam. After this, the cilia pushes the food towards the mouth of the clam for digestion. Cilia located in the mantle cavity produce a water current from the ingestive siphon into the mantle cavity and out through the egestive siphon. The second siphon carries away the water. The siphons also function as reproductive mechanisms. In mollusks that have shells, such as clams, mussels, and snails, the mantle is what secretes calcium carbonate and a matrix to form the mollusk's shell. They direct the trapped food toward the mouth. The gills are large because they are used for filter-feeding as well as respiration. The leader in the ice-fishing industry offering a full line of hardwater fishing supplies, including the Fish Trap® (flip over shelters), Clam™ pop-up hub-style shelters, IceArmor™ by Clam (outerwear: bibs, parkas, head & hand) and Clam Ice Fishing c The palps are anterior to the gills & ventral to the anterior adductor muscle. The food, collected by tentacles, is then transported to the mouth in a ciliate groove. 16.

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