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Like almost all scallops, the shell is fan-shaped and composed of two valves, each of which is convex and has broad ribs. The ribs radiate from the umbo , the rounded protuberance near the hinge. Again, like all scallops, beside the hinge are two irregular shelly flaps or auricles; the anterior one is normally much larger than the posterior one.
When the adductor muscles of a bivalve mollusk contract, the valves close, which compresses the ligament. When the adductor muscles relax again, the elastic resiliency of the ligament reopens the shell. Scallops swim through the water column by rapidly and repeatedly clapping (opening and closing) their valves. An interesting fact about ...
Pecten maximus, common names the great scallop, king scallop, St James shell or escallop, is a northeast Atlantic species of scallop, an edible saltwater clam, a marine bivalve mollusc in the family Pectinidae. This is the type species of the genus.
Ordinary valves can have many ports and fluid paths. A 2-way valve, for example, has 2 ports; if the valve is open, then the two ports are connected and fluid may flow between the ports; if the valve is closed, then ports are isolated. If the valve is open when the solenoid is not energized, then the valve is termed normally open (N.O.).
Valves stop (or regulate) the flow of liquids or gases. They are categorized by application, such as isolation, throttling, and non-return. Isolation valves temporarily disconnect part of a piping system to allow maintenance or repair, for example. Isolation valves are typically left in either a fully open or closed position.
In the Indian River Lagoon in Florida, two other scallops occur: the bay scallop, (Argopecten irradians), which generally has a uniform gray to gray-brown coloration with distinct convexity of the right (lower) valve. The other is the rough scallop, (Aequipecten muscosus), which has unequal 'ears' and has sharp scales on the lower surface of ...
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