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Unformatted text preview: Sarcodina Members of the phylum Sarcodina are the amoebas and their relatives. Amoebas consist of a single cell without a definite shape. They feed on small organisms and particles of organic matter, and they engulf the particles by phagocytosis. Extensions of the cytoplasm called pseudopodia (the singular is pseudopodium ) assist phagocytosis and motion in the organisms. Amoebas are found in most lakes, ponds, and other bodies of fresh water. They move by a creeping form of locomotion called amoeboid motion. One amoeba called Entamoeba histolytica causes a type of dysentery in humans. Two interesting amoebas are the foraminiferans and the radiolarians. Both are marine amoebas that secrete shells. Their shells have been identified as markers for oil deposits because both were present in the ocean communities that became the organic deposits that, under pressure, became oil...
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This note was uploaded on 11/11/2011 for the course BIO 101 taught by Professor Pesthy during the Fall '07 term at Texas State.
- Fall '07