Foraminiferida are an order of rhizopod protozoans characterized by the presence of granuloreticulopods and a test. Together with the Order Athalamida, they are the only Rhizopoda with anastomozing pseudopodia that contain granules (Fig. 1). The difference between the Athalamida and Foraminiferida is arbitrary because some foraminifera are known to leave their tests and move about, later returning to them (Marszalek, 1969), and some Athalamida attach foreign particles to the cell surface.