Clams that move do so by projecting a “foot,” which is a muscular, fleshy organ that can easily be projected from between the clams' two shells. Physically speaking, however, clams have no legs, arms, mouths or heads.Know More
The shells of clams are opened via two strong muscles and are needed because clams themselves have soft bodies. Despite not having legs or arms, clams still have hearts and blood vessels. Clams also have gills, which are used for removing not only oxygen but also food particles from water. This is why clams don't require mouths to eat.
The foot is not the only thing that clams extend out past their shells. To both breathe and feed, clams have to stick the ends of their siphons outside of their shells. Food is drawn into the clams' bodies by using cilia, which stir up water and make small currents. At this point, the food is passed throughout the clams' digestive systems, and the excess water is forced back out through the siphons.
Both little-neck and hard-shell clams are often referred to as quahogs. This was a name given to them by the Narraganset Indians. They are traditionally found along the Gulf of Mexico and on the Atlantic coast.Learn more about Marine Life
There are many different oceanic mollusks, such as clams, octopus and oysters, but there are also mollusks that live on land, such as snails and slugs. Mollusks are the second largest group of invertebrates in the world, with somewhere between 50,000 and 200,000 living species.Full Answer >
Of the 15,000 species of bivalves known as clams, some have life cycles of only one year. Individuals of one species called the ocean quahog, or Arctica islandica, however, are among the oldest living animals on Earth, with one captured specimen measured to be more than 500 years of age.Full Answer >
The differences between clams, mussels and oysters lie mostly in the shapes of their shells. Many types of clams have the classic clam-shaped shell with ridges or concentric rings. They also come in many colors and sizes, though the ones sold at the fishmonger's are only a few inches long. Razor clams resemble straight razors.Full Answer >
Cnidarians that move do so by flexing weak, gelatinous muscles in the body walls of their bells against a pressurized hydrostatic skeleton. However, many types of cnidarians, such as mature anemones and corals, move little if at all, although juvenile stages may take a more mobile form to disperse individual organisms. Even the more mobile types, such as jellyfish, move only weakly and generally drift as plankton with the current.Full Answer >