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Sarcodina - Sarcodina . .,andthey .(t

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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 
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