Foraminifera

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Definition of Foraminifera:
(= foraminiferans) phylum of mainly marine unicellular protists (classified as protozoans of class Sarcodina in older zoological classifications), having a highly vacuolated outer layer of cytoplasm and a calcareous, siliceous or composite shell through which project fine pseudopodia. Chalk is largely composed of foraminiferan shells and they are also major components of many deep-sea oozes.[1].
This is the common definition for Foraminifera, other definitions can be discussed in the article

References

  1. Lawrence, E. (2005). Henderson’s dictionary of biology. Pearson Education Limited, 13th ed., Harlow. 748 p.