Clam, in general, any member of the invertebrate class Bivalvia—mollusks with a bivalved shell (i.e., one with two separate sections). 8. The umbo is the bump on the … Purpose: The purpose of this lab is to identify the internal and external structures of a mollusk by dissecting a clam. According to this theory, each set of close rings and wide rings represent a year's growth. If the siphons are not visible, determine which is the ventral side by using the umbo. varices) - axial sculptural element that is more prominent than a costa, and usually more widely Hold it in your hand so the umbo is on the left. Ventral to the umbo, find the digestive gland, a greenish structure that surrounds the stomach. Where is the mantle located in the clam? The siphons are at the posterior end. Exhalent siphon: 2. What is the mantle cavity? Estimate the age of the clam you are … OBS: First-formed part of the bivalve shell. This is the oldest part of the clam shell. The left valve is on top if your clam is correctly positioned. In 2003, the value of U.S. major commercial bivalve species (especially the Soft-Shelled Clam, Hard-Shelled Clam, Surfclam, Geoduck, Blue Mussel, Eastern Oyster, and Sea Scallop) exceeded 570 million U.S. dollars. Locate the umbo, the bump at the anterior end of the valve. The valve of a clam is characterized by a scar from the posterior adductor muscle, the pallial sinus, pallial line, serrations on the exterior edge, an umbo, and cardinal teeth. What holds the two shells together? Become a … The species has a typical oval-triangular clam shape, with a dorsal “beak” or umbo at the peak of the shell. The large space found between the two lobes of mantle 11. Varix (pl. Place a clam in a dissecting tray and identify the anterior and posterior ends of the clam as well as the dorsal, ventral, & lateral surfaces. OBS: First-formed part of the bivalve shell. Fans that move food to mouth : Tongue with teeth for scraping food: Collects and removes nitrogen waste: Makes bile and absorbs nutrients: Coelom space surrounding a clam's heart: Collects and removes digestive waste: Space inside a clam shell: Pigment cells that … I. What is its function? The asari clam (Ruditapes philippinarum; also known as the Manila clam and short-necked clam) is indige- nous to coasts of East Asia and Japan. Carefully work the tip of the screwdriver between the valves so you do not jab your … Find the area near the dorsal surface that the intestine passes through called the pericardial area. Used … The fishery pro-duction in Japan decreased from a maximal produc-tion of 140000 tonnes in 1985 to 35000 tonnes in 2005 (Ministry of Agriculture, Forestry and Fisheries, Japan 2007). More than 15,000 living species of bivalves are known, of which about 500 live in fresh water; the others occur in all seas. Read PDF Dissection Guide For The Clam Mussel Answers valves and thus function to close the shell. Immune - Internal defence in bivalve molluscs, like all invertebrate species, is based on an innate, non-lymphoid immune system which consists of a variety of cell types and effector molecules … Sea Drills . umbo . Excurrent . Find The Posterior And Anterior Ends. Place a clam in a dissecting tray and identify the anterior and posterior ends of the clam as well as the dorsal, ventral, & lateral surfaces. SURVEY . The thin, whitish flesh lining is called the _____. The valves are attached dorsally by a hinge-ligament that opens the shell when the adductor muscles are relaxed. Materials Dissecting pan Dissecting kit Screwdriver Safety glasses Fresh clam Procedure: 1. beak cavity (noun) the depression or cavity on the inside of each valve beneath the beak. Q. Clams … (Left) Quahog (Mercenaria); (right) soft-shell clam (Mya) Russ … This is the oldest part of the clam shell. In bivalve: Internal features. 2. Clam Anatomy Labeling Page. 23. 1. The mantle, a thin membrane surrounding the body of the clam, secretes the shell. The paired labial palps in the mantle cavity are used in feeding. Match the items on the right to the items on the left. If you cannot see the siphon now, remember to look closely at it after you open the shell. If the siphons are not visible, determine which is the front end by using the umbo. Clam Dissection Information Sheet – External Anatomy Identify the function of the following structures: 1. Bivalves usually live on or in sandy or muddy bottoms. What muscle opens and closes the clam? Locate the siphon according to your diagram. Purpose: The purpose of this lab is to identify the internal and external structures of a mollusk by dissecting a clam. Carefully work the tip of the screwdriver between the valves so you do not jab your … 2. The average length of all clams measured by the class is _____ cm Inside of the clam: 1). It is also where new shell is made as the clam grows. Name the structure indicated. 9. 1. Q. 21. The beak is the oldest portion of a mussel shell, formed when the animal was very young. Tags: Question 6 . The mantle encloses all the internal organs of the clam. Umbo 3. The outside of the shell (periostracum) is olive, or yellowish to black-brown in color, with 1-3 brown/purple colored radial bands (particularly in juveniles) and white erosion rings near the umbo. Tags: Question 5 . What is the function of this structure? Gills 6. Name the structure indicated. Economically, the most important bivalves under aquaculture are Blue Mussels, with peak production of 500,000 annual metric tons in the late 1990s. Continue following the intestine toward … How do bivalves … The … The oldest part of the clam shell is the umbo, and it is from the hinge area that the clam extends as it grows. Excurrent and Incurrent. In some mollusks with shells, you can see the mantle extending from under the shell. I. Clam Dissection Guideline The first dissection shows a clam which has been opened by cutting the large adductor muscles , which attach to both Page 7/24. 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. Follow the intestine through the clam. Adductor muscle 4. 1. Although the reason for the decrease is un-known, … The oldest part of the clam shell is the umbo, and it is from the hinge area that the clam extends as it grows. Umbo (pl. SURVEY . Diagrams and Key: From Biodidac: Clam in Color. Incurrent. Locate the long, coiled intestine extending from the stomach. each side of the umbo. to show answer keys or other teacher-only items. 22. Question: Biological Problems Latb Observation: Anatomy Of A Clam External Anatomy 1. What do the rings on the clam’s shell indicate? The ventral siphon carries water into the shell and the dorsal siphon removes … Concentric lines extend outward from the umbo and represent lines of growth, much like the growth rings of a tree. The Shell Is An Exoskeleton. 3. Locate the umbo, the bump at the anterior end of the valve. This leads to its name, which means cloak or … function in bivalve nourishment. The umbo is the bump on the top of the shell. If the siphons are not visible, determine which is the ventral side by using the umbo. Examine an unopened clam in the finger bowl on the front bench. This way the anterior portion qfyour animal will be on the left, and the posterior on the right. What is a function of this structure? beak sculpture (noun) 10. Growth ring: 4. Mollusk parts and functions Matching exercise. The mantle, a thin membrane surrounding the body of the clam, secretes the shell. The siphons are at the posterior end. Turn the calm with its dorsal side down and insert a screwdriver between the ventral edges of the valves. I. The More Pointed End Of The Valves (the Halves Of The Shell) Is The Ig. Adductor. Surface Feeders. Examine The External Shell ( 2. umbones) - projected portion of the hinge. Umbo: Clam - umbo External Features exhalant (=excurrent) siphon growth ring inhalant (=incurrent) siphon Hinge "gament Anterior Posterior Lett . Turn the calm with its dorsal side down and insert a screwdriver between the ventral edges of the valves. Adductor. Respiration – oxygen/carbon dioxide exchange 7. There are two … Link to More Info About this Animal (with Labeled … Important features of bivalve shells are: two shelly valves; two adductor muscles (reduced to one in some species) that hold the shell tightly closed when they contract; an elastic ligament that springs the shell open when the muscles relax; a hinge with a series of … Accordingly, what is the function of the UMBO? The mantle, a thin membrane surrounding the body of the clam, secretes the shell. Check . Labial Palp. Pelagic Feeders. Notice that the siphon is actually made of two siphons. Purpose: The purpose of this lab is to identify the internal and external structures of a mollusk by dissecting a clam. Active Filter Feeders. Find the clam's heart in this area. It is wedge/axe shaped to help it dig. The clam excretes ammonia, a poisonous substance that requires the concomitant excretion of water, Land-dwelling animals tend to excrete a less toxic substance in a more concentrated form. Explain the functions of the organs of the clam (Anodonta). Many bivalve species from the ocean floor or at the coast pump water through their bodies and are know as: answer choices . Describe the clam’s foot. Describe the inside lining of … Locate the umbo, the bump at the anterior end of the valve. Muscle relaxes – shell open Muscle contracts – shell closes 5. Place a clam in a dissecting tray and identify the anterior and posterior ends of the clam as well as the dorsal, ventral, & lateral surfaces. As the clam ages, the periostracum becomes darker in color. Freshwater mussels are extremely long lived with some species living over 80 years. Name the structure indicated above. Inhalent siphon: 3. 30 seconds . Carefully use a clam shucker or scalpel to scrap the adductor muscle away from the top shell. Structures to pin and label: 1. excurrent siphon, 2. incurrent siphon, 3. valve, 4. foot, 5. umbo, 6. heart, 7. posterior adductor muscle, . What muscles open and close the clam? The outer palp on each side bears a long, extensible proboscis with a ciliated groove that collects organic material, which is then sorted by the inner pair and outer pair of palps. the raised portion of the dorsal margin of a shell, also called the umbo. Foot 8. Title: Clam Dissection Information Sheet – Internal Anatomy … Class Bivalvia (clams, scallops, ovsters and mussels) Clam dissection Obtain a preserved clam specimen. Concentric lines extend outward from the umbo and represent lines of growth. Name the clam’s siphons. 1. The growth lines are a result of non-uniform growth and are more closely spaced during winter growth than in summer. Figure 1 Figure 1 The left valve is on top if your clam is correctly positioned. It is the Umbo, and it is the coiled up hump like structure with the tight rings. Hinge Ligaments. located midway on the anterior surface of the shell. answer choices . On the anterior-dorsal part of each valve is a swollen region, the umbo. What is the function of this structure? 17.3) Of A Preserved Clam (Venus). The smallest clam is _____ cm wide and _____ cm long. It leans toward the front end. This is the oldest part of the clam shell. Find the hinge ligament which hinges the valves together and observe the growth rings. Patiemce is required so that you don't … The shell of the clam consists of two valves hinged together along the dorsal side. Posterior End. On the inside of the shell that has been separated, note the places where the adductor muscles … The oldest part of the clam shell is the umbo, and it is from the hinge area that the clam extends as it grows. They indicate how old the clam is; the more rings the older the clam. In mollusks that lack shells, such as the slug, the mantle is completely visible. The function is to secretes the shell, and respiratory organ. A hard exoskeleton composed of a pair of valves, or shells, protects the soft body. Find the hinge ligament which hinges the valves together and observe the growth rings. The anterior elevation near the hinged margin is the umbo. 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