The Foraminifera are single celled, mainly benthic, marine to brackish water protozoans that are amoeboid in shape (1A) but produce mainly calcareous tests (3 & 4) (some aggregate sediment particles in a hardened mucus (2)) through which extensions of the ectoplasm form parapodia (2, 3, 6 & 9).  These extensions are used for motility, anchoring to the sediment and to capture prey (diatoms and bacteria).  The taxonomy of this group is disputed as they are possibly grouped with radiolarians and cercazoans in the Infrakingdom Rhizaria.  All of these groups are important in carbon recycling as their tests sink carbon to the ocean floor from the atmosphere.