The growth lines are a result of non-uniform growth and are more closely spaced during winter growth than in summer. Find the hinge ligament which hinges the valves together and observe the growth rings. Varix (pl. Find the area near the dorsal surface that the intestine passes through called the pericardial area. Structures to pin and label: 1. excurrent siphon, 2. incurrent siphon, 3. valve, 4. foot, 5. umbo, 6. heart, 7. posterior adductor muscle, . They indicate how old the clam is; the more rings the older the clam. 22. Adductor muscle 4. umbo . It leans toward the front end. Although the reason for the decrease is un-known, … Read PDF Dissection Guide For The Clam Mussel Answers valves and thus function to close the shell. Surface Feeders. In bivalve: Internal features. Examine The External Shell ( 2. The umbo is the bump on the top of the shell. Diagrams and Key: From Biodidac: Clam in Color. Class Bivalvia (clams, scallops, ovsters and mussels) Clam dissection Obtain a preserved clam specimen. Freshwater mussels are extremely long lived with some species living over 80 years. Foot 8. The function is to secretes the shell, and respiratory organ. 10. The thin, whitish flesh lining is called the _____. Umbo 3. On the inside of the shell that has been separated, note the places where the adductor muscles … each side of the umbo. 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. This leads to its name, which means cloak or … Continue following the intestine toward … (Left) Quahog (Mercenaria); (right) soft-shell clam (Mya) Russ … Examine an unopened clam in the finger bowl on the front bench. If the siphons are not visible, determine which is the ventral side by using the umbo. Q. Clams … Concentric lines extend outward from the umbo and represent lines of growth, much like the growth rings of a tree. Muscle relaxes – shell open Muscle contracts – shell closes 5. I. Tags: Question 5 . beak sculpture (noun) The paired labial palps in the mantle cavity are used in feeding. Clam, in general, any member of the invertebrate class Bivalvia—mollusks with a bivalved shell (i.e., one with two separate sections). A hard exoskeleton composed of a pair of valves, or shells, protects the soft body. The average length of all clams measured by the class is _____ cm Inside of the clam: 1). What is a function of this structure? Match the items on the right to the items on the left. Umbo: Clam - umbo External Features exhalant (=excurrent) siphon growth ring inhalant (=incurrent) siphon Hinge "gament Anterior Posterior Lett . Describe the clam’s foot. 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. The siphons are at the posterior end. Locate the umbo, the bump at the anterior end of the valve. Umbo (pl. SURVEY . If the siphons are not visible, determine which is the front end by using the umbo. The ventral siphon carries water into the shell and the dorsal siphon removes … On the anterior-dorsal part of each valve is a swollen region, the umbo. 3. OBS: First-formed part of the bivalve shell. Title: Clam Dissection Information Sheet – Internal Anatomy … beak cavity (noun) the depression or cavity on the inside of each valve beneath the beak. This is the oldest part of the clam shell. 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. Accordingly, what is the function of the UMBO? 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). OBS: First-formed part of the bivalve shell. Tags: Question 6 . The Hard-Shelled Clam or Cherrystone, Mercenaria mercenaria, is used here as an example of a typical bivalve. 2. 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. Posterior End. Find the clam's heart in this area. The anterior elevation near the hinged margin is the umbo. It is wedge/axe shaped to help it dig. Materials Dissecting pan Dissecting kit Screwdriver Safety glasses Fresh clam Procedure: 1. Economically, the most important bivalves under aquaculture are Blue Mussels, with peak production of 500,000 annual metric tons in the late 1990s. Labial Palp. Sea Drills . Estimate the age of the clam you are … It is also where new shell is made as the clam grows. Excurrent . 8. Follow the intestine through the clam. 1. Turn the calm with its dorsal side down and insert a screwdriver between the ventral edges of the valves. Ventral to the umbo, find the digestive gland, a greenish structure that surrounds the stomach. What muscles open and close the clam? function in bivalve nourishment. This is the oldest part of the clam shell. What holds the two shells together? varices) - axial sculptural element that is more prominent than a costa, and usually more widely The mantle, a thin membrane surrounding the body of the clam, secretes the shell. Clam Dissection Information Sheet – External Anatomy Identify the function of the following structures: 1. The Shell Is An Exoskeleton. Become a … 30 seconds . 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. Carefully work the tip of the screwdriver between the valves so you do not jab your … More than 15,000 living species of bivalves are known, of which about 500 live in fresh water; the others occur in all seas. Mollusk parts and functions Matching exercise. 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. 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 … 9. The oldest part of the clam shell is the umbo, and it is from the hinge area that the clam extends as it grows. Patiemce is required so that you don't … It is the Umbo, and it is the coiled up hump like structure with the tight rings. SURVEY . In mollusks that lack shells, such as the slug, the mantle is completely visible. Find The Posterior And Anterior Ends. The umbo is the bump on the … Locate the long, coiled intestine extending from the stomach. Exhalent siphon: 2. Locate the umbo, the bump at the anterior end of the valve. Figure 1 Figure 1 The left valve is on top if your clam is correctly positioned. 1. Where is the mantle located in the clam? What is the function of this structure? This way the anterior portion qfyour animal will be on the left, and the posterior on the right. 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. Growth ring: 4. Hold it in your hand so the umbo is on the left. Link to More Info About this Animal (with Labeled … There are two … I. Check . What do the rings on the clam’s shell indicate? Locate the umbo, the bump at the anterior end of the valve. to show answer keys or other teacher-only items. Inhalent siphon: 3. The oldest part of the clam shell is the umbo, and it is from the hinge area that the clam extends as it grows. What is its function? The species has a typical oval-triangular clam shape, with a dorsal “beak” or umbo at the peak of the shell. 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. Adductor. What is the function of this structure? If the siphons are not visible, determine which is the ventral side by using the umbo. Clam Anatomy Labeling Page. Purpose: The purpose of this lab is to identify the internal and external structures of a mollusk by dissecting a clam. umbones) - projected portion of the hinge. The beak is the oldest portion of a mussel shell, formed when the animal was very young. 23. 1. The valves are attached dorsally by a hinge-ligament that opens the shell when the adductor muscles are relaxed. 21. Name the structure indicated. 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. What is the mantle cavity? 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. Respiration – oxygen/carbon dioxide exchange 7. The shell of the clam consists of two valves hinged together along the dorsal side. Q. Used … 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. Adductor. In some mollusks with shells, you can see the mantle extending from under the shell. the raised portion of the dorsal margin of a shell, also called the umbo. The smallest clam is _____ cm wide and _____ cm long. What muscle opens and closes the clam? Purpose: The purpose of this lab is to identify the internal and external structures of a mollusk by dissecting a clam. 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. answer choices . If you cannot see the siphon now, remember to look closely at it after you open the shell. Name the clam’s siphons. 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 … Name the structure indicated above. Active Filter Feeders. The mantle encloses all the internal organs of the clam. Carefully work the tip of the screwdriver between the valves so you do not jab your … The large space found between the two lobes of mantle 11. Hinge Ligaments. Gills 6. This is the oldest part of the clam shell. 30 seconds . The left valve is on top if your clam is correctly positioned. The siphons are at the posterior end. The More Pointed End Of The Valves (the Halves Of The Shell) Is The Ig. 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 … Locate the siphon according to your diagram. Describe the inside lining of … As the clam ages, the periostracum becomes darker in color. Bivalves usually live on or in sandy or muddy bottoms. Carefully use a clam shucker or scalpel to scrap the adductor muscle away from the top shell. Purpose: The purpose of this lab is to identify the internal and external structures of a mollusk by dissecting a clam. Excurrent and Incurrent. Concentric lines extend outward from the umbo and represent lines of growth. 17.3) Of A Preserved Clam (Venus). Notice that the siphon is actually made of two siphons. The mantle, a thin membrane surrounding the body of the clam, secretes the shell. Find the hinge ligament which hinges the valves together and observe the growth rings. Pelagic Feeders. According to this theory, each set of close rings and wide rings represent a year's growth. Many bivalve species from the ocean floor or at the coast pump water through their bodies and are know as: answer choices . Explain the functions of the organs of the clam (Anodonta). Incurrent. located midway on the anterior surface of the shell. Question: Biological Problems Latb Observation: Anatomy Of A Clam External Anatomy 1. The mantle, a thin membrane surrounding the body of the clam, secretes the shell. Name the structure indicated. Turn the calm with its dorsal side down and insert a screwdriver between the ventral edges of the valves. 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