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Razor shells can dig themselves into the sand with great speed to escape predation. When a Pacific razor clam (Siliqua patula) is laid on the surface of the beach, it can bury itself completely in seven seconds [90] and the Atlantic jackknife clam, Ensis directus, can do the same within fifteen seconds. [91]
At low tide the position of the Atlantic jackknife clam is revealed by a keyhole-shaped opening in the sand; when the clam is disturbed, a small jet of water squirts from this opening as the clam starts to dig. This species' remarkable speed in digging can easily outstrip a human digger, making the clam difficult to catch.
Atlantic surf clams reproduce in late summer, when the water temperatures peak. The shell of this species is a well-known object to beach-goers in the northeastern United States. People on the beach often pick up a large empty shell of this species, either to dig in the sand with, or take home to use as a decorative dish or ashtray. [2]
In an article adroitly headlined "F*cked Up Video of a Clam," Kelly Faircloth of Jezebel introduced the Twitterverse to an unnerving video of a geoduck wriggling its way into a mound of sand.
They prefer sand, mud, and gravel substrates, normally burying themselves 12–16 inches (30–41 cm), so they are much easier to dig than geoducks. Their preferred substrates are also preferred by butter and littleneck clams, so horse clams are often taken incidentally in commercial harvesting.
The anterior or front of the shell is where the byssus and foot are located (if the animal has these structures) and the posterior or back of the shell is where the siphon is located (again, if present— the scallops, for example, do not have siphons). Without being able to view these organs, however, determining anterior and posterior can be ...
Clams in the culinary sense do not live attached to a substrate (whereas oysters and mussels do) and do not live near the bottom (whereas scallops do). In culinary usage, clams are commonly eaten marine bivalves, as in clam digging and the resulting soup, clam chowder. Many edible clams such as palourde clams are ovoid or triangular; [3 ...
Additional weights (sand or cement) can also be used to offset the buoyancy of the body. "We take old ships and put them to rest at the bottom of the ocean, and that starts an ecosystem," said ...