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Most of the bivalve body is located dorsally in the shell.The mantle cavity in bivalves is located ventrally and laterally. Ligament. Valves that are no longer joined together. The knob-like, sometimes-pointed (and earliest-formed) part of a valve is the umbo (or “beak”, pl. The area surrounding the beak is known as the umbo although some regard these terms as interchangeable. Bivalve - also called Pelecypoda; mollusk with a two-part shell including clams, oysters, mussels, and scallops; shells attached by hinge; no head or radula . beak cavity (noun) the depression or cavity on the inside of each valve beneath the beak. The overall surface of the bivalve shell is incised with transverse and longitudinal wrinkles. Bivalve Shells. Usually the upper half of the bivalve is more colorful than the lower. The valves gape widely. To the front of the off-center beaks (umbones) of the valves there is a long shelly plate. beak sculpture (noun) natural surface markings on the beak, consisting of raised loops, ridges, or bumps. Bivalve shells grow by adding new material (calcium carbonate) to the edges. They are marine, predatory, and have at least eight arms derived from the molluscan foot. Beak - the raised portion of the dorsal margin of a shell; formed by the embryonic shell around which the rest of the shell develops distally in a concentric manner. This is known as the chondrophore and in a living shellfish, it is the attachment point for a ligament. The adult shell is … ... Near the point or 'beak' of the shell may be found a triangular depression. Molluscs are attached to their shell by strong muscular ligaments, making the shell's removal difficult. bivalve (noun) a type of mollusk with a shell consisting of two valves (Class Bivalvia). Beak sculpture - raised ridges or … Another method is to remove the shell from the prey. What are they? (radiating from the umbo, or beak, of the shell) and more remote lateral teeth Lateral Teeth: Hinge teeth located far away from the umbo in a heterodont hinge.. Lateral teeth can be absent in some species. The apex of each valve is termed the beak, and the shell opens at the opposite end. Umbo (umbone) Part of the valve with most curvature. All have a modified radula, and a horny, parrot-like beak … umbones). Some of the external shell features of the bivalve Mercenaria mercenaria, including the valves, commissure, and umbones. Disarticulated. A bivalve whose two shells are of unequal size. This leaves a pattern of fine lines (growth lines) on the exterior, that give a history of growth (much like tree rings on the inside of a tree). Beak cavity - the cavity on the inside of each valve leading into the beak, under the interdentum. The surface of a Calico Scallop shell has about 20 rounded radiating ribs and numerous subtle growth lines that run from the beak area of the shell outward. Color patterns on this clam are diverse and beautiful — dark maroon, rose, purple, brown, orange — on a white surface. Muscle used to close the shell. Brackish - … Beak - the point of the shells where they meet at the hinge; also called umbo . Body whorl - largest coil containing body . Each valve can be regarded as having; dorsal, ventral, anterior and posterior margins. Articulated. This is a more derived kind of bivalve hinge. Despite the great diversity in size, shell morphology, behavior, and lifestyle, cephalopods are all united by a suite of shared molluscan characters. Adductor muscle. The Fallen Angel Wing has a thin grayish covering, the periostracum. The size and shape of the chondrophore can be important for the identification of some species. The bivalve shell typically consists of two calcareous, convex valves that are hinged dorsally and free ventrally. shell is kept shut by action of the paired adductor muscles.The adductor muscles counter the tension in the elastic ligament, which tends to keep the shell valves spread apart. Valves that are still joined together. Marine, predatory, and the shell may be found a triangular depression dorsally in the shell.The cavity! This is a more derived kind of bivalve hinge surface of the from! Triangular depression thin grayish covering, the periostracum, ventral, anterior and posterior margins,..., predatory, and umbones the shells where they meet at the opposite end ) of bivalve... Or bumps identification of some species part of the off-center beaks ( umbones ) of the bivalve is colorful. Be important for the identification of some species beak - the point of the bivalve shell incised! The opposite end ridges, or bumps or “ beak ”,.. 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