5. Most bivalves are sessile. Explain your answer. Explain your answer. Clam Dissection Introduction The phylum Mollusca includes snails, clams, chitons, slugs, limpets, octopi, and squid. Explain your answer. Visceral mass remains covered by special skin called mantle, which is capable of secreting a shell. Habitus of different bivalves. 8. Do bivalves show cephalization? The external shell consists of three layers. individuals from Bermuda attached to a rock. all unwanted body parts from bivalves (S2, P15 and S3 P27) 2.5 Describe how to deal with bivalves and bivalve meats that are not fit . An initial survey 200. 4. 7. Bivalve mollusks can be found in both freshwater or saltwater. Most marine bivalves go through a trochophore stage before turning into a free-swimming veliger larva. Name one bivalve that is not sessile. As their name implies, they have two parts of their shell, which can open and close. ... Bivalvia= bivalved shell, dorsal hinge and adductor muscles . The umbo or hinge area, where the valves are joined together, is the dorsal part of the animal (Figure 6). For example, higher growth, body condition and reproductive output are usually observed at lower intertidal (exposed during low tide) areas than at higher ones (Jones et al. Two of the most prominent features of the bivalve body plan are the lack of a head region and the half shells connected by a dorsal hinge that surround the body. body burden of six metals, the effect of season on these bivalves and a model developed to explain excretion and accumulation of these metals in the bivalves. A bivalve shell is part of the body, the exoskeleton or shell, of a bivalve mollusk.In life, the shell of this class of mollusks is composed of two hinged parts or valves.Bivalves are very common in essentially all aquatic locales, including saltwater, brackish water, and freshwater. Do bivalves show cephalization? The heart pumps blood into a short vessel that opens into the body spaces containing the internal organs. 3. Bivalves include clams, scallops, oysters, and mussels. the most important factor influencing growth in bivalves at a local scale. Do bivalves show cephalization? The mantle is muscular, and many species have modified it to use for siphoning water for feeding and propulsion. What are siphons, and what is their purpose? The bivalve body comprises a dorsal visceral mass and a ventral foot, which is enclosed within a thin mantle, or pallium. Why are they called bivalves? Gastropods and Bivalve belong to the same phylum, Mollusc, but different classes due to very striking differences. How can you distinguish a mussel from a clam? What is bivalves have two shells held together by hinges and strong muscles. Bivalves consist of two shells. 6. Materials: Dissecting pan, dissecting kit, screwdriver, lab apron, plastic gloves, safety glasses, preserved clam Procedure 1. Describe the body of bivalves. 6. How do bivalves move? ... Incurrent siphon carries water into the clam and the excurrent siphon where water wastes and water Page 5/11. Bivalves live in both marine and freshwater habitats. (c.2 mm) in length, while the shell of the giant clam may exceed 4 ft (120.4 cm) in length. Unlike the gastropods that have one shell, or are lacking a shell altogether, bivalves are animals that have two shells, or valves. Explain your answer. Bivalve, (class Bivalvia), any of more than 15,000 species of clams, oysters, mussels, scallops, and other members of the phylum Mollusca characterized by a shell that is divided from front to back into left and right valves. Clams and oysters are some of the bivalves that live on the reef. The body plan of a mollusk usually consists of a head region, a muscular foot, and a visceral mass of internal organs that is often contained within a dorsal shell. It is from these two families that most people derive their general perception of mollusks as small, slimy creatures equipped with calcareous shells. Explain your answer. The mantle is an important part of the body of a mollusk. What are siphons and what is their purpose? The foot is located below the visceral mass. 9. There are more ways to increase your certainty. Starfish are one of the few groups of animals, along with jellyfish and sponges, that don't show cephalization. 4. The basic body structure, consisting of a foot, visceral mass, and mantle, is similar in most mollusks. The region opposite is the ventral margin. Lake Sapanca is an important water body in northwestern Turkey, both from an ecological and economic perspective. Describe the body of bivalves. Bivalve Body Plan. Uncertain but they are protosomes, schizocoelous, and have spiral determinate cleavage ... 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